1998 CELESTRON

Telescopes

CO N T E N T S

Schmidt-Cassegrain Telescopes.30 C5+.32 G 8.34 Celestar 8.35 Celestar 8 Deluxe.36 Celestar 8 Computerized.37 Celestar 8 Deluxe Computerized.37 Ultima 2000 - 8".38 CG-91/4.40 Ultima 91/4.41 Ultima 11.42 CG-11.43 CG-14.44 Warranty. 45 About Celestron International.46 Considerations in Choosing a Telescope.46
Refractor Telescopes. 3 Novice 50. 4 Novice 60. 5 Firstscope 60. 6 Firstscope 60 Deluxe. 6 Firstscope 60 Deluxe-Aluminum. 6 Firstscope 60 Short. 8 Firstscope 60 EQ Short. 8 Firstscope 60 EQ.10 Firstscope 60 EQ Deluxe.10 Firstscope 60 EQ Deluxe-Aluminum.10 Firstscope 70 AZ.12 Firstscope 70 EQ.12 Firstscope 80 AZ.14 Firstscope 80 EQ.15 Firstscope 80 EQ WA.16 C80-HD.17 C102-AZ.18 C102-HD.18 Newtonian Reflector Telescopes Tabletop 76.21 Firstscope 76-AZ.22 Firstscope 76-EQ.22 Firstscope 114.24 Firstscope 114 Deluxe.24 Firstscope 114 Premium.24 Firstscope 114 Short.26 C114-HD.27 Star Hopper 4 1/2.28 Star Hopper 6" 8".28 Star Hopper 11" 14" 171/2".28

C14 Photo

Celestron CCD imaging products available in a separate catalog

REFRACTOR TELESCOPES

Refractor telescopes (also known as dioptrics) are probably what most of us think of when we hear the word telescope. Refractors have a long, thin tube in which light passes in a straight line from the front objective lens directly to the eyepiece, at the opposite end of the tube. Refractor telescopes have many advantages, including: Simplicity of design, which translates into reliability and ease of use. Little or no maintenance requirements. Excellent lunar, planetary and binary star viewing. High contrast images with no secondary mirror or diagonal obstruction. Sealed optical tube, to protect the optics and reduce air currents, which tend to degrade image quality. Permanently mounted and aligned objective lens. The 60mm (2.4") refractor is the most popular telescope size for beginning astronomy enthusiasts and for casual gift-giving. This size telescope is perfect for introducing newcomers to astronomy, at an affordable price. For astronomical observing, the 60mm refractor allows you to see lunar details, Saturn and its rings, Jupiter and its moons, the phases of Venus, larger globular clusters, bright double stars and some bright nebulae. After adding an optional solar filter, you can observe activity on the sun. In addition, a 60mm telescope can be used for terrestrial viewing, bringing the world closer to you and allowing you to observe wildlife, distant views and your environment. The 70mm models serve the beginner to intermediate observer who wants slightly more aperture than the 60mm models and allows you to see more detail on objects. Celestrons 80mm and 102mm refractor models are top choices for beginning observers who want to start with a more powerful telescope and for intermediate level astronomers. These instruments perform equally well for viewing within our solar system and for deep-sky observing. Starting with a more powerful telescope can be a good option when youre looking for an instrument to grow with as you explore the hobby of astronomy. Celestron offers two different options in refractor telescopes: the altazimuth mount and the equatorial mount. The economical altazimuth is the simplest type of mount, offering two motions: altitude (up and down) and azimuth (sideto-side), for an easily achieved full range of motion. Celestrons equatorial models use the German equatorial mount with setting circles and slow motion controls on both the right ascension (R.A.) and declination (DEC.) axes. These features make it easier to locate and track objects. While observing, youll notice that as the earth rotates on its axis, stationary stars appear to move across the sky. Thus, due to the earths rotation, the object youre viewing will drift out of view in both axes, over time. A telescope on an equatorial mount can be aimed at a celestial object and guided with the slow motion controls to follow the object across the sky and keep it in the field of view of your telescope.

Novice 50

50mm (2") Aperture Focal Length of 625mm Focal Ratio of f/12 Standard.96" Accessories Include: 12.5mm H Eyepiece (50x), 8mm H Eyepiece (78x), 2x Barlow Lens, 90 Hybrid Diagonal (Designed to Accept Either.96" or 11/4" Eyepieces) 5x20 Finderscope Sturdy, Black Adjustable Wood Tripod with Accessory Tray Weight: 5 Lbs.

#21075

Firstscope 80 EQ
80mm (3.1") Aperture Focal Length of 900mm Focal Ratio of f/11 Fully Multi-Coated Optics Standard 11/4" Accessories include: 25mm SMA Eyepiece (36x), Focuser and 90 Diagonal 6x30 Finderscope Piggyback Mount Sturdy, Adjustable Wood Tripod with Accessory Tray Weight: 24 Lbs.
The Firstscope 80 EQ (Model #21070) is a good choice for the more serious beginning astronomer. The setting circles and slow motion controls on the R.A. and DEC. axes allow for greater control in both locating and tracking objects, making this equatorial telescope one you can grow with over time as your observing interests expand. The equatorial mount is larger and more rugged than the one supplied with the Firstscope 60s. The tripod is also larger and more rugged than offered on the 60mm sizes or on most competitive 80mm models. The achromatic optics are made to Celestrons exacting specifications and are quite excellent. The standard accessories for this telescope add up to a highly desirable viewing instrument that performs superbly. This telescope works well for both terrestrial and astronomical observing.

#21070

Firstscope 80 EQ WA
80mm (3.1") Aperture Focal Length of 400mm Focal Ratio of f/5 Fully Multi-Coated Optics High Quality 6x30 Finderscope Standard 11/4" Accessories include: 25mm SMA Eyepiece (16x), Focuser and 90 Diagonal Sturdy, Adjustable Wood Tripod with Accessory Tray Weight: 13 Lbs.
The Firstscope 80 EQ WA (Model #21072) is a wide angle, rich field telescope with a short tube that easily captures breathtaking, wide field views of large deep-sky objects. Its a great choice for viewing comets and its dimensions make it highly portable, when viewing out in the field is your goal. The German equatorial mount and tripod are the same sturdy design used on the Firstscope 60 EQ telescope. The light weight and short tube make this a super portable instrument for easy traveling. This telescope is also useful for terrestrial viewing and the fast focal ratio allows for excellent telephoto images. A photo adapter is included and all that is needed for photography is a T-ring for your specific 35mm SLR camera.

#21072

C80-HD
80mm (3.1") Aperture Focal Length of 900mm Focal Ratio of f/11 Fully Multi-Coated Optics Standard 11/4" Accessories include: 20mm Plssl Eyepiece (45x), Focuser and 90 Diagonal 6x30 Finderscope Sturdy, Adjustable Aluminum Tripod with Accessory Tray Weight: 29 Lbs.

The premium optics of this heavy duty telescope are manufactured to Celestrons uncompromising standards. The star images are classic textbook Airy disks. The C80-HD is mounted on the CG-4 mount, a very rigid German equatorial mount. A counterweight, latitude scale, setting circles and slow motion controls on both axes are standard, so you have a fully loaded telescope, right from the start. This heavy duty refractor telescope stands out from the other 80mm telescopes on the market by having by far the best mount.

#21077

C102-AZ

#21011

C102-HD

#21016

102mm (4") Aperture Focal Length of 1000mm Focal Ratio of f/10 Fully Multi-Coated Optics Standard 11/4" Accessories include: 20mm Plssl Eyepiece (50x) and Focuser 45 Erect Image Diagonal 11/4" (Model #21011) 90 Mirror Diagonal 11/4" (Model #21016) 6x30 Finderscope Sturdy, Adjustable Aluminum Tripod with Accessory Tray Weight: 28 Lbs. for #21011, 36 Lbs. for #21016
These telescopes are carefully designed for the more serious astronomer and terrestrial observer and feature exquisite optics and precision, heavy duty mounts. The optics of these telescopes are made to exacting standards, with high quality materials to ensure top performance. Youll find that astronomical viewing is a delight with these large, powerful 4" telescopes. They offer a 63% increase in image brightness over 80mm models, with the larger aperture delivering incredible images of: the moon; Saturn and its ring structure; Jupiter and its belts; and hundreds of deep-sky objects, including galaxies, nebulae and star clusters. The altazimuth mount is easy to use and has slow motion controls on both the R.A. and DEC. axes. These controls are on flexible cables, to allow for quick and easy pointing and tracking. For terrestrial use, you can enjoy views from your own backyard or take your telescope out in the field to enjoy the natural environment, up close. The C102-HD is mounted on the CG-4 mount, a very rigid German equatorial mount. A counterweight, latitude scale, setting circles and slow motion controls on both axes are standard.
N E W T O N I A N R E F L E C T O R TE L E S C O P E S
Newtonian telescopes (also known as catoptrics) usually use a concave parabolic primary mirror (longer focal ratios may use spherical primaries) to collect and focus incoming light onto a flat secondary (diagonal) mirror. This secondary mirror reflects the image out of an opening at the side of the main tube and into the eyepiece.
Newtonian reflector telescopes offer a number of excellent features including: Freedom from most optical aberrations and delivery of very bright images. Reasonably compact and portable to focal lengths of 1000mm. Excellent performance observing faint deep-sky objects such as nebulae, remote galaxies and star clusters. Lowest cost per square inch of aperture due to use of mirrors rather than lenses. Generally fast focal ratios: f/4 to f/9. The 76mm (3") aperture of the Firstscope 76 models offer much of the performance of the Newtonian reflector design in a compact, highly portable instrument. The 114mm (4.5") Newtonian equatorial telescope is the most popular size telescope for the more serious beginning or intermediate level astronomy enthusiast, and for good reason. The large light gathering power of this 41/2" telescope makes it ideal for deep-sky observation of galaxies, star clusters and nebulae,as well as lunar and planetary observing. This makes for a very useful and versatile instrument that can take an observer from the very first time looking through a telescopes eyepiece, through years of observing interesting subjects near and far in the night sky. Celestron offers five different 114mm Newtonian equatorial telescopes, making it a sure bet that one of them will have just the combination of features and performance youre looking for.

114mm (4.5") Aperture Focal Length of 900mm Focal Ratio of f/8 11/4" Focuser with.96" Adapter 11/4" Eyepieces Weighs: 19 Lbs.
Models #31048 and #31050 include:
5x24 Finderscope Sturdy, Adjustable Wood Tripod with Accessory Tray

Models #31052 includes:

6x30 Finderscope Sturdy, Adjustable Aluminum Tripod with Accessory Tray
The damping time and rigidity of this aluminum tripod match that offered by the wood tripods of the other Firstscope 114 models, allowing those who prefer a metal tripod that option, without sacrificing performance. In fact, youll find this aluminum tripod is much sturdier than those offered on competitive models. Model #31048s economical 11/4" Eyepieces include a 20mm H Eyepiece (45x), 4mm SR Eyepiece (225x) and 2x Barlow Lens The Deluxe Model #31050 includes high quality 11/4" Eyepieces a 25mm SMA Eyepiece (36x) and a 10mm SMA Eyepiece (90x). The Premium Model #31052 features premium grade 11/4" Eyepieces 20mm Plssl (45x) and 10mm SMA (90x).
#31050 (#31048 similar in appearance)

Firstscope 114 Short

114mm (4.5") Aperture Focal Length of 1000mm Focal Ratio of f/9 Standard 11/4" Accessories Include: 20mm H Eyepiece (50x), 6mm F Eyepiece (167x) and 2x Barlow Lens 11/4" Focuser with.96" Adapter 5x24 Finderscope Sturdy, Adjustable Wood Tripod with Accessory Tray Weight: 16 Lbs. This version of the 41/2" Newtonian telescope offers more portability than
the standard longer tube Newtonian. The short tube of this model is only 18 long. The equatorial mount is quite stable, with setting circles and slow motion controls on both axes for easy, smooth tracking.

#31046

C114-HD
114mm (4.5") Aperture Focal Length of 900mm and Focal Ratio of f/8 Standard 11/4" Accessories Include: 20mm Plssl Eyepiece (45x) and Focuser 6x30 Finderscope CG-4 EQ Mount Sturdy, Adjustable Aluminum Tripod with Accessory Tray Weight: 28 lbs.
The premium optics of this heavy duty telescope are manufactured to Celestrons uncompromising standards. The star images are classic textbook Airy disks. The C114-HD (Model #31027) is mounted on the CG-4 mount, a very rigid German equatorial mount. A counterweight, latitude scale, setting circles and slow motion controls on both axes are standard, so you have a fully loaded telescope right from the start. This heavy duty 114mm Newtonian stands out from the other 114mm telescopes on the market by having by far the best mount.

Some of the advantages of the Schmidt-Cassegrain design are: Excellent optical systems delivering razor sharp images over a wide field. High performance in almost all situations; terrestrial viewing and photography; lunar, planetary and deep-sky observing; astrophotograpy with fast film; CCD imaging. Best all-around, multifunction telescope design; it combines all the optical advantages of both mirrors and lenses, while canceling their disadvantages. Focal ratios generally in the range of f/10, which is useful for all types of photography. A telescope thats compact, portable, easy to use, durable, virtually maintenance free and has a closed tube. The best near focus capability of any type of telescope design. Large apertures at quite reasonable prices. Many accessories available. Schmidt-Cassegrain telescopes are designed to meet many needs and these compact, portable, user-friendly telescopes have a strong following. At Celestron, we pride ourselves on producing consistently superior optics and earning our customers devotion to the Schmidt-Cassegrain telescope. Each optical system is individually hand figured and guaranteed to be diffraction limited. Fine corrections are made on the secondary mirrors, that smooths the optical figure. To maintain tight quality control, each Celestron SchmidtCassegrain telescope is manufactured in the U.S.A.
Hand figuring of an optical system is a complex optical procedure done only on a commercial basis by Celestron. The art of hand figuring does take time but the results are easily evidenced by the superior resultant astrophotographs and viewing obtained. Celestrons optical testing is performed on double-pass auto-collimators in a temperature controlled environment. This ensures the highest quality on a consistent basis. Our commitment to the most careful optical fabrication and most stringent testing and quality control is for one purpose: to produce the very best Schmidt-Cassegrain telescopes available anywhere. All Celestron Schmidt-Cassegrain telescopes utilize the multicoated Starbright coatings group. High Reflectivity (HR) coatings are used on the mirrors for increased reflectivity and Anti-Reflection (AR) coatings are used on the correcting lens for increased light transmission. In fact, Celestrons Starbright coatings provide the best light transmission by a large margin over the competition, according to Sky & Telescope magazine. In addition, the optical systems are optimally baffled to ensure the highest contrast levels. To provide consistent customer satisfaction and high performance, all Celestron Schmidt-Cassegrain optical assemblies, at each aperture size, utilize the same superior optics, whether in a basic or full featured model.

C8 Photo

5" (127mm) Aperture Focal Length of 1250mm Focal Ratio of f/10 Standard 11/4" Accessories Include: 25mm SMA Eyepiece (50x), Star Diagonal and Visual Back 6x30 Finderscope Unique Single-Arm Fork Mount with Carrying Handle Weight: 23 lbs. Made in the U.S.A.

For astronomy on the go, the C5+ cant be beat. Due to its excellent SchmidtCassegrain design and careful crafting, this telescope is a serious, high performance instrument, and its compact size makes it really portable. The total weight of the C5+, with wedge, is just 23 lbs., making it easy to transport. The C5+ can be equipped with many optional accessories to customize it for your particular observing interests. The C5+ boasts a light gathering ability which exceeds that of a 31/2" telescope by 100% and that of a 4" telescope by 50%, giving you a very powerful instrument. The C5+ offers views of intriguing lunar details and high power planetary viewing. You can see detail in Jupiters equatorial belts, the beautiful ring structure of Saturn and the polar caps of Mars. The C5+ is large enough to observe hundreds of deep-sky objects with ease, fully resolve many globular star clusters, and allow you to enjoy viewing brighter nebulae, double stars and brighter galaxies. The C5+ is made in the U.S.A. and features Celestrons legendary hand-figured, diffraction limited optical system for optical performance you can depend on. The reputation for excellence of this telescope is such that it was chosen by NASA, over all other competitive models, for several recent space shuttle missions.

#11030

The optical system of the C5+ features Starbright coatings. An Astronomy magazine review said, the C5 I tested contained superb optics. At high powers, stars exhibited a clearly defined Airy disk surrounded by a bright first diffraction ring and several successively fainter outer rings. This was a telescope that demonstrated how well SchmidtCassegrain optics can perform and met Celestrons promise of diffraction limited optics. An innovative, rigid single-arm fork mount with carrying handle makes this telescope quite convenient to carry. The spur gear drive has been reengineered and utilizes a rigid polar axle with pre-loaded tapered roller bearings in a sturdy and accurate drive system. The DEC. axis uses two pre-loaded ball bearings for smooth, rigid movement. All controls on the mount are precision engineered and manufactured. Sky & Telescope magazine said, the C5 has the smoothest focusing control I have ever used on a Schmidt-Cassegrain telescope. The DC electronics of the C5+ have a built-in drive controller, activated with an optional hand control. The R.A. motors main tracking speed is an accurately regulated sidereal rate. The hand control allows fast and slow override of the R.A. tracking speed and operation of the optional DEC. motor. A comment from the Sky & Telescope review the digital electronics delivered a near perfect sidereal tracking rate. The C5+ is powered by a 9 volt alkaline battery and runs for 50 hours. The C5+ can be operated in both the Northern and Southern hemispheres (optional hand controller required). This telescope is also an ideal choice for astrophotography and CCD imaging. Youll find that the C5+ is truly a multipurpose instrument an astronomical telescope, a spotting scope and a 1250mm f/10 telephoto lens all rolled into one instrument. Because the C5+ can perform so many functions, it has a quick release tube assembly and unique dovetail mounting system with safety locks, to move from one task to another with ease. The six lb. optical tube assembly can be removed from the fork tine, without tools, in just seconds. Next, it can be mounted to a rigid photo tripod for terrestrial applications, such as bird watching, nature study, enjoying distant vistas or for use as a 1250mm telephoto lens. Its near focus is just 20 feet, so subjects both near and far can be observed. The C5+ can even be converted to a computerized telescope with optional accessories. The standard equatorial wedge supplied with the C5+ has a built-in bubble level and is adjustable from 0 to 90.

8" (203mm) Aperture Focal Length of 2032mm Focal Ratio of f/10 Standard 11/4" Accessories Include: Two Eyepieces 25mm HM (81x) and 8mm H (254x), Star Diagonal and Visual Back 6x30 Finderscope CG-5 EQ Mount Sturdy Adjustable Aluminum Tripod with Accessory Tray Weight: 45 lbs. Optical tube Made in the U.S.A.
If youre looking for a superior first telescope with a traditional German equatorial mount or want to move up to a larger aperture telescope, consider the G-8 telescope (Model #11023) which is mounted on the CG-5 EQ mount, the newest generation of Celestrons German mounts. Both axes of the equatorial mount have precision worm gears for extremely smooth motion. This heavy duty mount delivers jitter-free images easily and the adjustable height, very rigid tripod has excellent damping characteristics and a convenient accessory tray. Included are setting circles on both axes, slowmotion controls and latitude scale. An adjustable counterweight makes it easy to point, balance and use. The G-8 optical system comes with Starbright coatings and its large aperture offers light gathering power 843 times that of the human eye. An optional polar alignment scope for fast polar alignment as well as a motor drive is available for easy tracking.

#11023

Celestar 8
8" (203mm) Aperture Focal Length of 2032mm Focal Ratio of f/10 Standard 11/4" Accessories Include: 25mm SMA Eyepiece (81x), Star Diagonal and Visual Back 6x30 Finderscope Fork Mount and Celestrons Unique Wedgpod Weight: 37 lbs. Made in the U.S.A.
The Celestar 8 is engineered for unsurpassed optical performance in an affordable, full featured Schmidt-Cassegrain telescope of large enough aperture to do serious deep-sky observing. This telescope is carefully crafted and manufactured in the U.S.A. for dependable quality of the highest caliber. It offers the lowest price ever for a Celestron fork mounted 8" telescope. The Celestar 8 has earned a well deserved reputation for reliability and consistently superior diffraction limited optics. The DC powered electronics are the same as those supplied with Celestrons C5+ telescope, ensuring exquisitely accurate sidereal rate tracking. A hand controller is an available option for fast and slow override of R.A. tracking speed and operation of the optional DEC motor. The totally cordless electronics have a built-in drive corrector, which is activated when using the optional hand controller. The Celestar 8 is powered by 9 volt alkaline batteries and runs for fifty hours of uninterrupted viewing. Versatility is added by the fact that the Celestar 8 can operate in both the Northern or Southern hemispheres from 0 to 90. Southern Hemisphere operation requires the optional hand controller. The highly regarded spur gear drive utilizes a rigid polar axle with pre-loaded tapered roller bearings in a sturdy and accurate drive system. Celestrons unique Wedgpod is a combination wedge and tripod with a fixed height of 33". Its lightweight for portability without sacrificing stability. The Celestar 8 can even be converted to a computerized telescope with optional accessories.

Celestar 8 Deluxe Computerized

#11018

The Celestar 8 Deluxe Computerized telescope is the same telescope as the Celestar 8 Deluxe, but with the addition of Celestrons Advanced Astro Master. This exceptional telescope has all of the very best features offered by Celestrons Celestar 8 series. Its the perfect choice for the astronomer who wants it all and demands the very best. Optical excellence, a smooth functioning and highly accurate worm gear drive system, stepper drive motor electronics and the Advanced Astro Master add up to a telescope youll be proud to own and use.

Advanced Astro Master

Ultima 2000 8"
8" (203mm) Aperture Focal Length of 2032mm Focal Ratio of f/10 Standard 11/4" Accessories Include: Multicoated 26mm Plssl Eyepiece (78x), Star Diagonal and Visual Back 9x50 Finderscope Heavy Duty Fork Mount and Adjustable Metal Tripod Hand Controller with LED Display Star Charts Included Weight: 39 lbs. Made in the U.S.A.
Twelve years ago, Celestron was the first company to offer computer driven, go to telescopes. Celestron now offers the Ultima 2000, an 8" Schmidt-Cassegrain computer driven telescope. Every facet of this telescope has been carefully engineered using the most sophisticated computer design tools. The best expertise available in the industry was brought to bear on the design of the Ultima 2000. This expertise was combined with a substantial amount of input from customers, astronomers, and telescope dealers and distributors to create a computerized telescope with spectacular performance. Although this is a highly sophisticated telescope, its also extremely simple to use. All you have to do is find two alignment stars, easily located on the star charts provided, and the adventure begins! The database contains over 10,000 deep-sky objects and has room for 25 user-defined objects and planets, for easy locating of your favorite subjects. Also, a special feature allows you to view your fifteen favorite subjects by season, automatically. All of these user-friendly features make this telescope a delight to use.

#11010

The Ultima 2000 has altazimuth operation and an incredible 15 per second fast slewing speed. The motors operate very quietly and have five useful speeds: 15 per second, finder speed at 3 per second, 6x sidereal, 2x sidereal or 50% of sidereal. The telescope also boasts four built-in tracking rates: sidereal, King, lunar and solar. All Ultima 2000 functions are easily performed using the convenient hand controller, which is a standard accessory of this telescope. Fully enclosed optical encoders are used for position location, so if you move the telescope manually, it still knows where its at. The universal standard 12 volt system of the Ultima 2000 runs off of eight AA alkaline batteries for 24 hours, under normal usage. A built-in voltmeter keeps you apprised of battery condition while the telescope is in use. The clock drive is state-of-the-art in design with a worm gear drive. The rigid fork mount design has unsurpassed stiffness for complete reliability. The disc clutch manual motion is fully adjustable in both axes and is very smooth. The 9" pre-load plate bearing ensures superior stability. For easy portability, the fork mount has carrying handles on both tines. The astrophotography/CCD imaging potential offered by the Ultima 2000 is quite remarkable. All you need to add is an optional equatorial wedge and a few accessories, and you have one of the best amateur astrophotography/CCD imaging set-ups available. The built-in drive corrector is a standard feature. For even greater versatility, use the Ultima 2000s RS-232 port to control the telescope via PC computer. The telescope itself is very rigid, but quite portable, at 28 lbs. (39 lbs. with tripod).

CG-91/4

91/4" (235mm) Aperture Focal Length of 2350mm Focal Ratio of f/10 Standard 11/4" Accessories Include: 26mm Plssl Eyepiece (90x), Star Diagonal and Visual Back 6x30 Finderscope Hand Controller Standard Adjustable, Lightweight Aluminum Tripod with Accessory Tray Vibration Suppression Pads Included Weight: 53 lbs. Made in the U.S.A.
The CG-91/4 telescope combines the unequaled optical excellence of a Celestron 91/4" Schmidt-Cassegrain telescope with an impressive German equatorial mount. #11038 The setting circles are laser engraved for readability down to 1/4 degree in DEC, and four minutes in R.A. The R.A. circle is direct reading indexed to the R.A. gear motion. All these technical features deliver the smoothness, refinement, controllability and precision that youve always wanted in a fine mount. Both axes are driven by a 2.8" diameter, 180-tooth worm gear. The high precision worms are hardened and precision ground stainless steel, double supported by pre-loaded ball bearings. 100 oz./in. stepper motor drives provide reliable, instantaneous response. This results in excellent tracking accuracy. The CG-91/4 dual axis DC electronics are state-of-the-art. Four tracking rates are available: sidereal, King, lunar and solar. There are four setting rates: 4x, 8x, 16x and 32x, and three photo guide rates: 30%, 50% and 2x. The electronics have built-in, full feature PEC (periodic error correction). In addition, theres a built-in TVC (time variable constant) feature thats programmable by the user for declination backlash compensation, giving instantaneous tracking results. Sky & Telescope magazine said, the drive is so accurate that tracking was superb whether or not the electronic PEC feature was switched on. A cigarette lighter car battery adapter is included to obtain DC power from your automobile. Further, the CG-91/4 can become a computerized telescope with the simple addition of Celestrons optional Advanced Astro Master. The equatorial head on the CG-91/4 mount weighs 21 lbs., without the counterweight bar and is the single heaviest component of this telescope. This means that the CG-91/4 is a high power, high performance telescope that remains portable, so it can go wherever your viewing interests take you. Celestron offers an optional polar alignment scope.

Ultima 91/4

91/4" (235mm) Aperture Focal Length of 2350mm Focal Ratio of f/10 Standard 11/4" Accessories Include: 25mm SMA Eyepiece (94x), Star Diagonal and Visual Back 6x30 Finderscope Hand Controller PEC Electronics Adjustable, Rigid Metal Tripod, Heavy Duty Wedge and Deluxe Latitude Adjuster Weight: 74 lbs. Made in the U.S.A. Ergonomic, user-friendly operation is the trademark of the Ultima telescopes. The Ultima 91/4 and 11 telescopes were designed with functional use as a top priority, and they deliver. The superb optics use high transmission Starbright coatings to capture the brightest, sharpest images. The newly designed fork tines of the mount and drive base are sand cast and they add greater stability. The totally cordless DC servo quartz drive system runs on an ordinary 9 volt battery. It has PEC (periodic error correction) and an easy four minute recording cycle. The highly accurate worm gear drive has four tracking rates including sidereal, King, lunar and solar, and a slew speed of 400% sidereal rate. The Ultima 91/4 includes a heavy duty wedge, deluxe latitude adjuster and latitude scale. Celestrons optional Advanced Astro Master can be added to create a computerized telescope.

#11035

Ultima 11
11" (279mm) Aperture Focal Length of 2800mm Focal Ratio of f/10 Standard 11/4" Accessories Include: Multicoated 26mm Plssl Eyepiece (108x), Star Diagonal and Visual Back 9x50 Finderscope Hand Controller Adjustable, Rigid Metal Tripod, Heavy Duty Wedge and Deluxe Latitude Adjuster Weight: 80 lbs. Made in the U.S.A.
The Ultima 11 has all of the features and performance of the Ultima 91/4, but at an 11" aperture. This size aperture allows for easy high power viewing and incredible images of a huge array of deep-sky objects. At the same time, the compact SchmidtCassegrain design makes this powerful telescope portable enough to load in your car and take out to your favorite observing sites. Further, this design is user-friendly, so even a beginner can enjoy using a large telescope. The images captured by this versatile telescope are superb, due to optics designed to perform flawlessly. The drive system is the same as that of the Ultima 91/4, so a high degree of accuracy is a given. And, the Advanced Astro Master is an optional accessory that will allow you to computerize the telescope easily.

A BOUT C ELESTRON INTERNATIONAL
Celestron defines the cutting edge where superior optics and design, new technology and old fashioned values merge. The result is innovation built on a solid foundation. Honesty, integrity and fairness arent mere words at Celestron. They are the core of our approach to business, realized in a full line of quality products designed to offer affordable exploration of the stars, in strong customer service, and in tough quality standards. Celestron means first-rate designs and craftsmanship that will eclipse your expectations. Precision assembly and meticulous attention to detail by our craftspeople ensure that you receive the highest possible quality. It is this superior assembly that guarantees hour after hour of easy and comfortable use. Our goal at Celestron is to manufacture the best telescopes in the world, and in the forty years weve been in business, weve earned the reputation of providing affordable optical excellence. Its this well-deserved reputation for excellence that make Celestron the first choice in telescopes around the world. Recommended by amateurs, professionals and educators alike, Celestron is the choice for reliability, exceptional performance and customer satisfaction. If youre already a Celestron customer, youve experienced the satisfaction of knowing youve obtained the ultimate in optical precision and mechanical execution. If youve new to Celestron, we invite you to learn more about our products, so you can choose the one thats right for you.

C ONSIDERATIONS

CH O O S I N G

T ELESCOPE

Celestron offers a full line of telescopes, and at least one of them is the perfect choice for you, given your particular interests, preferences, budget considerations and viewing conditions. Choosing the right telescope will enhance your viewing experience, and if youre a beginning observer, it will help you to get a good start in astronomy. To assist you in making a choice youll be happy with, this catalog offers a wealth of information, from telescope basics to specific details about each Celestron telescope. There are three basic commercial telescope designs: refractor, Newtonian reflector and Schmidt-Cassegrain. Celestron offers a range of excellent choices within each of these categories of telescope types. These sections include information on the design, function and the unique advantages, in turn, of refractor, Newtonian reflector and Schmidt-Cassegrain telescopes. Following the specifics on each telescope type are descriptions of all the Celestron instruments which fall within that particular design category. This should give you a good foundation of knowledge from which to shape your decision. Contact your Celestron dealer to answer any questions you may have and to demonstrate the Celestron telescopes that interest you the most. Celestron also offers the informative brochure Telescopes for Astronomy (item #94114) for those interested in exploring telescopes and their functions further. Please request a copy. We encourage you to examine our products carefully. Celestron telescopes provide a long term investment in quality and satisfaction, whatever your interests in astronomical or terrestrial viewing may be. Choosing the right telescope will give you years of observing enjoyment. Celestron has all the optional accessories youll want, whichever telescope you choose. Whether your interest is in planetary, lunar, solar or deep-sky observing or photography, accessories can expand the performance of your telescope. As your interests grow. Celestron accessories will allow your telescope to grow with you and take you into exciting new realms of astrophotography, CCD imaging, terrestrial observing and photography, and celestial adventure. Celestrons accessories are described in our Accessories Catalog (#93685).

C11 Photo

Celestron International
2835 Columbia Street Torrance, CA 90503 (310) 328-9560 (310) 212-5835 Web site at http://www.celestron.com
#93714-98 $2.Celestron International