Even if one blinking bar mark or no bar mark appears on the display panel while checking the batteries, exposure will be correct as long as the shutter releases.

< Batteries >

This camera will not operate without batteries. Try to make a habit of checking the
batteries at the following times. After loading new batteries. After storing the camera for a long time. If the shutter does not release. When you are using the camera in low temperatures. Before shooting important events.
Use a new set of batteries as specified below or equivalent batteries of another brand. 1. Four AA size 1.5 V alkaline batteries LR6 (AM-3) 2. Four AA size 1.5 V carbon-zinc batteries R6 (SUM-3) 3. Four AA size 1.2 V Ni-Cd batteries
Notes: Always use four new batteries of the same brand and replace them at the same time. Wipe the battery terminals and the camera contacts with a clean, dry cloth before loading, to ensure proper contact. Remove the batteries if you do not expect to use the camera for about three weeks or longer. When shooting in temperatures below 0C (32F), keep your camera and spare batteries close to your body or in a pocket to keep them warm until you are ready to take a picture. You can also use a set of Ni-Cd batteries which function well in low temperature. - approx. 15 rolls in the HIGH mode and 45 rolls. in the LOW mode at -20C ( - 4F) with 24-exp. film. (- p.34) When using Ni-Cd batteries, please note that different brands have different types of terminals. Be sure to use a type which is suitable for the camera. Refer to the manufacturer's instructions for recharging Ni-Cd batteries. Three bars ( - ) may not appear on the display panel during the battery check, even if using fully charged Ni-Cd batteries, because of their low nominal voltage. The battery naturally discharges even when not in use, so try to check the batteries regularly. Preliminary Preparations

Loading the Film

1) To open the back cover, push the back cover latch down while pressing the back cover lock button.
2) Insert the upper flat end of the film cartridge into the film chamber first, then lower the other end. The film-load check mark (@) will then appear on the display to indicate that film is loaded.

3) Pull the film leader across the back of the camera until its tip is aligned with the orange index.
4) Close the back cover. The camera will advance the film automatically and stop when "1" appears in the frame counter brackets on the display panel.
5) Make sure that the film has no slack and that its perforations are properly engaged with the sprocket teeth.
CAUTION Before loading the first film cartridge, remove the plastic insert and throw it away. NEVER touch the shutter curtain. It is sensitive to pressure due to its high precision design. Be careful that the film leader does not touch the shutter curtain, either.
* If the film leader extends past the orange index, take out the film cartridge and manually wind the excess film back into the cartridge.
When the humidity is high, film becomes soft and is easily torn. Keep the film stored in its canister until just before you load it to keep it from tearing.
While the camera is advancing the film, the film transport bars (also serve as the battery check marks) will appear at the bottom of the display panel moving in sequence from left to right. If the film has not been correctly advanced, however, the bars blink after the camera has stopped. In that case, reload the film.
<Automatic Setting of the Film Speed>
The T90 is designed to automatically set film speed by sensing the DX code marked on the film cassette.
1. When using a film with DX code, you do not have to set the film speed. (ISO 25 - 5000) The film speed automatically set according to the DX code will appear on the display panel while the camera is advancing the film toward the first usable frame.
2. When using a film without DX code, set the film speed manually. a) While pressing the film speed button, turn the electronic input dial until the film speed (indicated by ISO) of your film appears on the display panel. (ISO 6 - 6400) b) Remove your finger from the film speed button. The preset film speed will appear and blink on the display panel to warn you if the film speed is not set. Always be sure to set the film speed correctly. (Once the film speed is set, the warning stops) Film passing through X-ray examinations at airports, even when loaded in a camera, may be exposed and ruined. To avoid accidental exposure, tell the inspector you want your camera and film hand checked. Basic Operation Shooting with the Lens Set on "A" Mark.
Setting the Film Rewind Mode
Shooting Capacity (with 24-exp. film) Temperature/Battery Normal (20C/68F) Low (-10C/14F) Low (-20C/-4F) Film winding mode HIGH LOW HIGH LOW HIGH LOW Alkaline (LR6/AM-3) Carbon-zinc (R6/SUM-3) 3 -
*based on canon's standard test method
S (single) : single frame
C (continuous): H (high): max. 4.5 frames per second
C (continuous): L (low): max. 2 frames per second
1 ) Open the palm wing and set the film winding mode/selftimer selector to "S-C". S-C: film winding mode setting : self-timer setting ( - p.84) 2) Press and release the film winding mode button (also serves as the self-timer button) to set the desired film winding mode on the display panel. Automatic Film Winding Speed Changeover Function The Canon T90 has an automatic film winding speed changeover function which will change the film winding speed from HIGH to LOW mode when battery power drops below a prescribed voltage. This saves battery energy and extends battery life, so more pictures can be taken with the same batteries. When the winding speed is automatically switched to the LOW from HIGH, the ">" mark pointing at the HIGH on the display panel starts blinking to warn you. In this case: 1. If you wish to drive the camera in the HIGH mode, replace the batteries with new ones. 2. If you want to make the blinking ">" stop, though you continue to shoot in the LOW mode, press the film winding mode button to set the "> " mark to LOW mode on the display panel. Basic Operation Shooting with the Lens Set on "A" Mark.

Setting the Shooting Mode
<Shooting Modes of the T90> The Canon T90 has various shooting modes to meet your needs and what you want your picture to portray. The following is an explanation of the shooting modes in which the FD lens must be set to the "A" mark. (AE photography is possible only with FD lenses.)
1. Shutter-priority AE (with safety shift function) You set the shutter speed and the camera automatically chooses the correct aperture for the lighting conditions. This mode is useful for taking pictures of moving subjects and for normal snap shots. By controlling the shutter speed, you can also control the subject's movement. Faster shutter speeds freeze subject motion while slower shutter speeds can provide artistic blur effects. <Shutter-priority safety shift function (ON/OFF possible)> If the selected shutter speed is too slow or too fast for the light conditions, the T90 automatically switches the shutter speed to a higher or a lower one to avoid under- or overexposure.
Shuttle-priority AE with safety shift function (when the shuttle speed is set to 1/125 sec and the FD50mm f/1.4 lens is used)
2. Aperture-priority AE (with safety shift function) You set the aperture and the camera automatically chooses the correct shutter speed for the lighting conditions. This mode is useful for portraits, landscapes and still life photography in which depth of field, i.e. the range of in-focus images is an important factor. <Aperture-priority safety shift function (ON/OFF possible)> If the selected aperture is too large or too small for the lighting conditions, the T90 automatically switches the aperture to a smaller or larger one to avoid incorrect exposure.
Aperture-priority AE with safety shift function ( when the aperture is set to f/5.6 and the FD 50mm f/1.4 lens is used)
3. Standard program AE (Program) 3. Standard program AE (Program)
Both the shutter speed and the aperture are automatically set according to the brightness of the subject and a programmed shutter speed/aperture combination. The standard program AE is the most popular programmed AE because it emphasizes neither the shutter speed nor the aperture size. The program AE mode is convenient for those who are taking pictures with an SLR for the first time, those who do not like to worry about complicated operation, those who would simply like to concentrate on picture composition, or daily snap shots. 4. Variable-shift program AE

1) While pressing the shooting mode selector, turn the electronic input dial until the "Av" indicating the aperture-priority AE appears on the display panel. 2) Remove your finger from the shooting mode selector. At this point, the initial aperture setting is always 5.6 (f/5.6) 3) Turn the electronic input dial until the desired aperture value is displayed on the display panel.
Aperture Value display 1.2 1.4 1.8 2.0 2.5 2.8 3.4.5 5.6 6.9.27 32
Notes: The aperture is automatically set to f/5.6 when switching to the aperture-priority AE mode from other modes. Be sure that the aperture value set on the display panel is between the maximum and minimum aperture of your lens. Otherwise exposure will be incorrect. (e.g. when using the FD 50mm f/1.4 lens, set the aperture between f/1.4 and f/22.)
<Setting the Safety Shift Function>
1) Set the T90 to the shutter-priority AE (Tv) or the aperturepriority AE (Av). 2) Press both the film speed button and the exposure compensation button at the same time for approx. 1 sec. 3) The " SS " mark indicating the safety shift will then appear on the display panel and the safety shift function will be activated. 4) To clear the safety shift function, press both the film speed button and the exposure compensation button again until the " SS " disappears.
Notes: Setting the safety shift function is possible in any mode, but is effective only in the shutter-priority AE and the aperture-priority AE modes.
3. Setting the standard program AE
1) While pressing the shooting mode selector, turn the electronic input dial until "Program" appears on the display panel. 2) Remove your finger from the shooting mode selector.
4. Setting the variable-shift program
1) While pressing the shooting mode selector, turn the electronic input dial until "P" indicating the variable-shift program AE appears on the display panel. 2) Remove your finger from the shooting mode selector. 3) Turn the electronic input dial until the desired program AE (any one of seven modes ) is displayed on the display panel.

<Sequential AE lock photography>
When shooting continuously using the AE lock mechanism in the same lighting conditions (e.g. backlit subjects), it is not necessary to meter the subject for each shot as long as you keep the shutter button pressed halfway down between exposures.

Focusing

1) While looking into the viewfinder, turn
2) The subject is in focus when the upper
the focusing ring until the main subject is sharp.
and lower halves of the central split rangefinder merge to become one unbroken image.
Laser-matte screen New split rangefinder This screen can be used on all surfaces. This divides the subject in half The subject is in focus when the image is horizontally. The subject is in focus when not fuzzy. the two halves merge to become one unbroken image. Microprism rangefinder This breaks the subject into tiny fragments, causing a shimmering effect when out of focus. The subject is in focus when the image in the microprism ring is The T90's focusing screen can be changed according to the subject you are clear and not shimmering. shooting and the lens in use.

Shooting

1 ) Gently press the shutter button halfway down 3) Slide the main switch to "L" to turn off the to check the exposure. Exposure will be correct camera when shooting is finished. unless the aperture value and/or the shutter speed blink in the viewfinder. Press the shutter button GENTLY for the least camera shake. 2) Compose the picture and gently press the
shutter button all the way to take the picture. The film will be automatically advanced to the next frame.
When shooting continuously, the viewfinder information will not be displayed. Your picture, however, will be correctly exposed since exposure will not be affected.
If the correct exposure is not possible, the aperture value and/or the shutter speed will blink The film will be automatically advanced to the in the viewfinder to warn you of incorrect exposure next frame after exposure and the frame counter on the display panel also indicates the next frame Please see p. 1 on the exposure warning to be exposed. displays and how to correct each case.
< Viewfinder Information Examples >
< Exposure Preview Button > When you only want to check the exposure, press the exposure preview button instead of the shutter button. When the exposure preview button is pressed, the viewfinder information is turned on just as when the shutter button is pressed halfway. The exposure preview button is positioned so that you can press it while turning the electronic input dial.
< Remaining Frame Counter >
You can check how many frames remain any time, even during shooting, as displayed on the right of the viewfinder.
1. When using a film with DX code The remaining frames are displayed on the right of the viewfinder by the "<" mark, "F" (Film) and the figure. The figure display appears only when the remaining frames has become less than 9. When the T90 is used in the spot metering mode, the stopped-down (fixed index) metering mode or the FE lock mode together with the Speedlite 300TL, "<" mark is not displayed. "F" and the figures from 1 to 9 are displayed.)

< Manual Diaphragm Control >
Stopped-down metering is necessary whenever you insert accessories, such as Extension Tubes M, between the camera and the FD lens for close-up photography. 1 ) Insert the slot of the accessory manual diaphragm adapter (optionally available) over the tip of the automatic aperture lever at the rear of the lens. 2) Push the lever counterclockwise and lower the adapter into the groove. 3) Mount the lens as it is onto the accessory.
Do not mount the lens with the manual diaphragm I adapter directly onto the camera or the Auto Bellows I etc.
< Film Plane Indicator >
This mark, engraved on the top of the camera body, indicates the exact position of the film plane. It is useful for measuring the exact shooting distance from film to subject in close-up photography. Distance on the lens' distance scale are calibrated from this mark.

Bulb (Long Exposure)

It is possible to make an exposure longer than 30secs when doing such types of photography as astro or night photography. 1) While pressing the shooting mode selector, turn the electronic input dial until "bulb" appear on the display panel. 2) Manually set an aperture. 3) The shuttle will remain open as long as you press the shuttle button.
The Canon T90 is designed so that bulb exposure requires relatively little power, thus saving energy.
When using an FD lens, be sure to remove the aperture ring of the lens from the "A" mark.
-Bulb operation time is display on the display panel by a series of 3 bars and the numbers 1-30. Each bar mark(-) indicates 30 seconds. Exposure time up to 120 seconds is possible( 3 bars plus 30) -It is possible to control the exposure time within a range of 23hours 59 minutes seconds seconds by using the command Back 90 (optionally available) -Use of a tripod and cable release is recommended when making long exposures.

40 seconds

120 seconds

Self-timer Photography

The self-timer allows you a time-lag of either 2 or 10 sees. Use the 10 sec self-timer when you want to be in the picture too' end use the 2 sec timer as an alternative to a cable release for the softest possible shutter release in close-up photography. 1 ) Open the palm wing and set the film winding mode/self-timer selector to " ~ " 2) Press and release the self-timer button (also serves as the film winding mode button) to set either 2 or 10 sees. on the display panel. 3) Focus the subject and compose the picture. 4) Make sure the exposure is correct by checking the viewfinder information, then press the shutter button. The self-timer operation indicator will start blinking and the frame counter will display the countdown of seconds until shutter release.

5) The shutter will be released automatically 10 sees after the shutter button is pressed. 2 sees before shutter release, the self-timer operation indicator will begin blinking at a faster rate. * When the 2 sec timer is set, the self-timer operation indicator begins blinking at a faster rate. If your eye will not be at the viewfinder the moment you press the shutter button, close the eyepiece shutter by pushing the eyepiece shutter lever to avoid stray light from entering. Do not stand in front of the lens when you press the shutter button or exposure may be incorrect. If you have started the self-timer but wish to cancel it before shutter release, press the battery check button inside the palm wing or move the film winding mode/self-timer selector off the " @ " position.

Exposure Compensation

It is necessary to correct exposure in the cases for example, when you want high-key (intentionally overexposed) or low-key (Intentionally underexposed) shots, and when you take a backlit subject with center-weighted average metering. With the T90, exposure compensation is possible in the following two ways: 1) the exposure compensation index 2) H/S control in the spot metering
< Exposure Compensation Index >
1) Press the exposure compensation button. The 2) While pressing the exposure compensation exposure compensation index will then appear on button, turn the electronic input dial to move the " the display panel instead of the film transport bars. ~ " dot under " [1] " to the desired point on the exposure compensation index. " [1] " indicates that no exposure compensation is made. It is possible to make the exposure compensation in increments as small as 1/3 f/stop.
3) Remove your finger from the exposure compensation button. The film transport bars will appear on the display panel again, and " w " dot will blink at the position where you have moved it for exposure compensation. At the bottom of the viewfinder, "+/ - " mark will be displayed to warn you that the camera is in the exposure compensation status. 4) To cancel the exposure compensation, move the " ~ " dot back to "[1]" position, in the same as above.

The whole numbers are for increasing exposure while the fractions are for reducing exposure The numbers of "2" and "1/2" are equivalent to one f/stop (or one step of the shutter speed). while "4" and "1/4" are equivalent to two f/stops (or two steps of the shutter speed). The intermediate settings indicate increments of 1/3f/stop. When it is difficult to determine exactly how much correction to make, bracket the exposure by changing the position of the "~" dot.
Other Shooting/ Exposure Compensation

Multiple Exposure

The T90's provision for multiple exposures allows you to easily make two or more exposures on the same frame for creative effect. Preset multiple exposures up to 9 times with the single operation of the electronic input dial and continuous multiple exposure photography are possible.
1) Press both the shooting mode selector and the metering mode selector at the same time. The " ME " mark indicating multiple exposure mode will then appear on the display panel and the frame counter will become "1". 2) While pressing both, selectors, turn the electronic input dial to the desired number of exposures (for example, set "3" on the frame counter if you want to make three exposures on the same frame ) 3) Remove your fingers from both selectors.
1 Before shooting 1) Press both the shooting mode select and the metering mode selector at the same time again. 2) While pressing both selectors turn tt electronic input dial to return the frame counter to "1". 3) Remove your fingers from both selector The " ME " mark will disappear and multiple exposure mode is cleared.
2 While shooting The operating procedures are basically the same as above, but turn the electronic inp dial until the While shooting, the " 3 " mark will flash on and off frame counter is blank or there no frame counter to warn you that the camera is in the multiple display in step 2). exposure status. Each time the shutter is released the preset number of exposures on the frame counter will decrement by 1. When the preset number of exposures have been completed, the film is automatically wound to the next frame and the multiple exposure status is automatically cleared.
<Changing the Preset Exposures > 1) Before shooting 1) Press both the shooting mode selector and the metering mode selector at the same time again. 2) While pressing both selectors, turn the electronic input dial to change the preset number of exposures. 3) Remove your fingers from both selectors.

2) While shooting The operating procedures are all the same as above. < Exposure Compensation in Multiple Exposures > When you make multiple exposures, it is necessary to correct the amount of exposure depending on the situation because the same frame is exposed several times. You can easily correct the exposure with the exposure compensation index. Notes 1 The method described above is merely a general guideline. Actually, the amount of exposure compensation varies according to the situation so your technique will benefit greatly from practice. 2 It is not advisable to make multiple exposures on the first or last several frames due to possible film curl which may adversely affect image registration. 3 Generally, the first exposure of a series should be of a relatively dark subject so that the image in the next exposure will show up clearly. Number of multiple exposure Double Triple Quadruple Exposure compensation index 1/2 Between 1/2 and 1/4 1/4
Shooting with Infrared Film
When you load the T90 with black and white infrared film, it is necessary to make a slight adjustment in focus. A red infrared index is engraved on most Canon lenses for this purpose. 1) Focus as usual looking through the viewfinder. 2) If, for example, the lens is focused at 10 m on the distance scale turn the focusing ring to align the 10 m mark with the red dot. 3) Release the shutter after making this correction.
Notes 1. When using infrared film, it is necessary to use a deep red filter, as specified by the film manufacturer. 2. The position of the infrared index mark has been computed for the use of infrared film with peak sensitivity at 800 nm. 3. When using color infrared film, read the instructions of the film manufacturer.

Flash Photography

Canon developed the PMS (Permanent Magnet Shutter), which makes flash photography with an X-sync speed of 1/250 sec possible. The Canon Speedlite 300TL is an impressive flash unit for exclusive use with the T90. It has solved the problems of both conventional TTL and external flash systems. The main features are as follows:
< Canon Speedlite 300TL >
1. A-TTL Mode This mode automatically responds to a wide range of illuminations from dark surroundings to bright, so automatic fill-in flash is possible. Using the TTL control system, this mode measures the light reflected from the film surface directly by the sensor inside the camera. In cases such as fill-in flash photography, this A (Advanced)-TTL mode balances the exposure level between the main subject and the background to prevent unnatural

2. FE Lock TTL Mode With the world's first spot metering for flash photography using the principle of AE lock, this mode gives correct exposure even when the main subject is not in the center of the viewfinder. TTL flash photography is possible without being affected by the reflectivity of the film in use since the TTL control system of this mode does not use the reflection from the film surface. Automatic fill-in flash is possible.
effects. "FE lock" stands for flash exposure lock.
4. Second Curtain Synchronization With the focal plane shutter, flash synchronization is made when the first shutter curtain is fully open. With the combination of the Speedlite 300TL, however, it is also possible to make the flash synchronization just before the second shutter curtain starts running. 3. FE Lock + H/S Control It is also possible to use the FE lock mode of the Speedlite 300TL with the H/S control of the T90 to independently control the exposure level for the main subject with the flash and the exposure level for the background with the ambient light. In addition, the "P" position at which even beginners can enjoy advanced techniques such as fill-in flash, without fear of failure, is provided. Manual flash photography is also possible in the Manual Hi mode with a guide number of 30 (ISO 100.m) and in the Manual Lo mode with that of 7.5 (ISO 100.m). Aside from exposure control, the Speedlite 300TL offers several other features. One is bounce flash. Another feature is the built-in zoom of its flash head, which can use flash energy more efficiently. One of its safety features is the SE (Save-energy) function which prevents unnecessary consumption of battery energy if you forget to turn off the flash. The Canon Speedlite 300TL is thus a high-performance, automatic, electronic flash unit.
When using multiple flash accessories such as the TTL Hot Shoe Adapter, the TTL Distributor and the Off-camera Shoe Adapter with the Speedlite 300TL automatic TTL multiple flash photography is possible with up to four flash units
* First curtain synchronization (The flow of light is unnatural for the subjects' movement)
* Second curtain synchronization (natural)
Viewfinder Information When the shutter button is pressed halfway, after the flash has been charged, you can confirm the exposure in the viewfinder.
<Other Canon Speedlites >
1. T-series Speedlites PROGRAM mode - The shutter speed is automatically set to 1/90 sec upon flashcharge completion. An aperture is selected automatically by the flash. F.NO.SET mode - The shutter speed is automatically set to 1/90 sec upon flashcharge completion. An aperture is set on the flash manually. 2. 577G, 533G and A-series Speedlites The shutter speed is automatically set to 1 /90 sec upon flash -charge completion. An aperture is set on the flash manually.

Ten eyesight correction lenses are available in powers of +3, +2, +1.5, +1, +0.5, o,, - 0.5, 2, - 3 and4 diopters. They may make viewing and focusing easier if you are near or farsighted. Choose the one which is closest to your eyeglass prescription, and make a practical test if possible.
Positioning Guide This accessory is a special stabilizer which is necessary when the T90 is used with the Camera Holder F4, the Focusing Rail, or the camera support bracket of the Speedlites 577G and 533G. Slide the Positioning Guide 90 to attach it. The Positioning Guide 90 comes with the attachment screw. When the Camera Holder F4 or the | camera support bracket of the Speedlites 577G and 533G is used with the T90, use the attachment screw provided with the Positioning Guide 90. When the Focusing Rail is used, however, use the one provided with the Focusing Rail.
Close-up/ Macrophotography Accessories
Accessories such as the Auto Bellows, Copy Stand 5 and various extension tubes are designed for everything from simple close-up photography to life-size and magnified macro photography.

Cable Release Adapter T3

This is an accessory for use with the Double Cable Release when using the Auto Bellows. It is possible to use this adapter with the Release 30 or 50.

Remote Switch 60T3

The Remote Switch 60T3 is designed to be used when the camera is mounted on a tripod for close-up shooting or when using a telephoto lens with which camera-shake is a particular problem. Attach directly to the camera's remote control socket.

Lens Hood

We strongly recommend the use of a lens hood to keep out side light which may cause flare and ghost images to form on the image. Rigid Canon hoods also help to protect the lens from shock. Use only a hood which is specified for your particular lens. Most Canon hoods fit into the bayonet mount and are fixed by turning. For details please see the lens instruction manual.
Interchangeable Focusing Screens
You can change the focusing screen in your T90 according to your specific focusing needs. Canon offers eight different types of focusing screens for the T90.

Application

A: Microprism Matte/Fresnel field with microprism rangefinder spot in the center of the screen. Especially suited for general photography when using an aperture of f/5.6 or larger.
B: New Split Matte/Fresnel field with split-image rangefinder spot in the center of the screen. The lens is in focus when the bottom half is even with the upper half. Suited for general photography since unlike former focusing screens, rarely does one-half of the rangefinder darken, even when using small maximum aperture lenses. C: All Matte Matte/Fresnel field with clear matte center spot. Especially recommended for macro and telephoto photography, this screen enables the entire field of view to be seen without distraction. The lens is in focus when the subject can be clearly seen.
D: Matte/Section Similar to C screen but with horizontal and vertical reference lines. Recommended for architectural photography and copy work in which accurate image placement is essential.
E: New Split/Microprism Standard with the T90. Three focusing methods (split image, microprism and matte/fresnel) are possible according to preference.
H: Matte/Scale Matte/Fresnel field with fine matte center plus horizontal and vertical scales in millimeters. Recommended for close-ups, photomacrography copy work and architectural photography where it is useful to know the size of the subject or the magnification involved. I: Double Cross-hair Reticle Matte/Fresnel field with clear center spot containing double cross-hair reticle. While focusing, move your eye left to right. If crosshairs stay in the same position on the subject, then the subject is in focus. Recommended for photomicrography, astrophotography, or other applications requiring high magnifications. L: Cross Split-image Matte/Fresnel field with cross split-image in the center of the screen which divides the subject in half both horizontally and vertically. The subject is in focus when the four quarters merge to become one unbroken image. Suitable for general photography.
NEVER change the screen with your fingers. A special tool is provided with each accessory focusing screen to facilitate screen replacement.
These focusing screens are exclusively designed for the T90. Do not use them on other cameras.

Caring for Your Camera

As with any precision instrument proper care and maintenance involve a few simple rules in addition to common sense. Observing these few rules will keep your T90 in top condition at all tames. We recommend that you clean your T90 periodically using the tools listed below.
Cleaning tools: Blower brush, Cleaning fluid; Cleaning tissue, Silicone cloth (1) To clean the lens surface and the view finder : Blow off dust with the blower brush and then gently wipe the lens surface with a lens cleaning tissue which has been moistened with a few drops of lens cleaner. (2) To clean the reflecting mirror and the focusing screen: Use only a blower brush. If more cleaning is necessary, NEVER attempt to do it yourself but take it to an authorized Canon service facility. (3) To clean the film chamber: The film chamber also requires occasional cleaning with a blower brush to remove accumulated film dust particles which might scratch the film. (4) To clean the film pressure plate and the film guide rails: Lightly wipe the surface with a cleaning tissue moistened with cleaning fluid.