Photomacrography with the MP-4
Exposure Guide Selecting the right lens for photomacrography Basic Focusing Steps Magnification Tables

MP4/MP4+ Exposure Guide1

How to determine recommended shutter speed: Table A: Find the number that applies to the speed of the film you are using. Table B: Measure the length of the material being copied and the length of its focused image on the ground glass (to determine the reproduction scale). Find the corresponding number in the table. Table C: Decide which lens f-stop you wish to use. Find the number that corresponds to that f-stop. Table D: Add the numbers you get from Tables A, B, and C. Find that number in Table D, and see the suggested shutter speed. If your total has a 1/2 in it, use the next higher full number from Table D.

Table A

Film Speed ISO3000/36. 1 ISO800/30.. 3 ISO400/27.. 4 ISO200/24.. 5 ISO100/21.. 6 ISO80/20.. 6 1/2 ISO50/18.. 7 ISO25/15.. 8 ISO3/6. 11 With color films, adjust the speed to compensate for filter factors.

Table D

(Total of A + B + C) Shutter Speed (exposure time)* Shutter Speed 7... 1/125 sec. 8... 1/60 9... 1/30 10... 1/15 11... 1/8 12... 1/4 13... 1/2 14.. 1 sec. 15... 2 16... 6** 17... 15** 18... 40** 19... 1 min.** 20... 4 min.**
*Filtration will be necessary for Polacolor films. See the current film instructions for specific details. **Includes compensation for low light-level reciprocity failure. This compensation is an average for Polaroid instant films in general, and thus a rough guide only. Note that color films will require filtration in addition to a longer exposure.

Table B

Reproduction Scale 1:10 to 1:5.. 1 1:4 to 1:2.. 2 1:1.. 3 1.5X.. 3 1/2 2X.. 4 3X.. 5 4X.. 5 1/2 5X.. 6 6X.. 6 1/2 7X, 8X.. 7 9X, 10X.. 8
Measure the length of the original and its length on the ground glass to determine the reproduction scale.
For information or technical assistance: From within the U.S., call toll-free 1-800-343-5000, Monday-Friday, 8 AM to 8 PM (Eastern Time). If outside the U.S., contact the nearest Polaroid office.

Table C

Lens Aperture f/4.5.. 1/2 f/5.6.. 1 f/8. 2 f/11.. 3 f/16. 4 f/22. 5 f/32. 6 When setting the lens between two f-stops, use half numbers. Thus, for f/11-f/16 use 3.
This is intended as a guide, not a precise exposure indicator. You may have to compensate for unpredictable variables which affect exposure, such as brightness of window or room lighting, differences in color or contrast of the subject material, voltage fluctuations, or the age of the lamps.
Selecting the right lens for photomacrography
The table below shows the range of magnifications you can achieve with each of the MP-4 lenses. Note that you have several lens options for achieving various magnifications. For example, to enlarge an object five times, you can use a 75mm lens with two macro extensions, a 50mm lens with one macro extension, or a 35mm lens by itself. If you have a choice between two or more lenses, always use the lens with the longer focal length. The longer the focal length, the more space you have between the subject and the lens. For example, with the 75mm lens at full bellows extension (about 3x), the space between the lens and the object would be about 4 inches (10 cm). To achieve the same magnification with the 50mm lens, the space between the lens and object would be a relatively cramped 1.5 inches (4 cm).

Approximate Magnification Ranges
Lens 135mm 105mm 75mm (min.=2x) 50mm (min.=2x) 35mm (min.=5x) 1:1 1:5x 2x 3x 4x 5x 6x 7x 8x 9x 10x 12x 14x
17mm (min.=10x) Code: camera alone with one macro extension with two macro extensions

Basic Focusing Steps

To focus, set the lens aperture at its largest opening (smallest f-number). Then follow these basic steps.
With the magnification tables:
1. Select the appropriate table according to the MP-4 camera head you are using. 2. Find the lens-to-film distance (bellows extension) to give the desired magnification. 3. Adjust the camera bellows until the lens-to-film distance appears. 4. Move the camera head as close as possible to the object. Then raise the head slowly until the image appears sharp. 5. Compose the picture within the appropriate scribe marks on the ground glass. 6. Lock the camera on the column. 7. Insert the film holder and set the exposure.
Without the magnification tables:
To focus without using the magnification tables, adjust the bellows extension to get the approximate image size. Then move the camera head up or down (or use a focusing stage) for sharp focus. The bellows extension determines magnification. To increase image size, increase the bellows extension and reduce the lens-to-subject distance. To decrease image size, reduce the bellows extension and increase the lens-tosubject distance. If you get a sharp image that is not quite the size you want, make a small adjustment of both the bellows extension and the lens-to-subject distance.

MP-4 Fixed Head

Magnification 1:1 2x 3x 4x 5x 6x 7x 8x 9x 10x 11x 12x 13x 14x 15x 16x 18x 20x 22x 24x 26x 28x 30x 32x 135mm 22.5 24.0* 25.5** 105mm 16.9 15.4* 25.9* 24.4** 75mm 18.2 25.7 21.2* 16.7** 24.2** 50mm 11.2 16.2 21.2 26.2 19.2* 24.2* 17.2** 22.2** 35mm 17mm
16.6 20.1 23.6 15.1* 18.6* 22.1* 25.6* 17.1** 20.6** 24.1**
10.6 12.3 14.0 15.7 17.4 19.1 20.8 24.2 15.6* 19.0* 22.4* 25.8* 17.2** 20.6** 24.0**

MP-4 Sliding Head

Magnification 1:1 2x 3x 4x 5x 6x 7x 8x 9x 10x 11x 12x 13x 14x 15x 16x 18x 20x 22x 24x 26x 28x 30x 32x 34x 135mm 22.1 23.6* 25.1** 105mm 16.5 27.0 25.5* 24.0** 75mm 17.8 25.3 20.8* 16.3** 23.8** 50mm 10.8 15.8 20.8 25.8 18.8* 23.8* 16.8* 21.8* 26.8** 35mm 17mm
16.2 19.7 23.2 26.7 18.2* 21.7* 25.2* 16.7** 20.2** 23.7**
10.2 11.9 13.6 15.3 17.0 18.7 20.4 23.8 15.2* 18.6* 22.0* 25.4* 16.8** 20.2** 23.6** 27.0**
*Add one macro extension. **Add two macro extensions.

WASHOE COUNTY

"Dedicated To Excellence in Public Seruice" www.co.washoe.nv.us
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Sr.q.Fr Rrponr BOARD MEETING DATE: June 23.2009

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May2l,2O09
Board of County Commissioners
Renee Romero, Laboratory Director rromero@washoecountv.us, 328 -28I 5
THROUGH: Michael Haley, Sheriff

SUBJECT:

Approve the donation of miscellaneous used laboratory equipment from the Washoe County Sheriff s Forensic Science Division to the Washoe County School District at an estimated value of $3,650.00.
(All Commission Districts) SUMMARY
The Washoe County SherifPs Forensic Science Division would like to donate to the Washoe County School District items of outdated laboratory equipment and supplies that are no longer in service.
County Priority/Goal supported by this item: This purchase meets the2OO6/2008 Washoe County's Priority and Strategic Goal Improved Regional Collaboration.

PREVIOUS ACTION

BACKGROUND
The Sheriff s Forensic Science Division has accumulated numerous miscellaneous items of outdated laboratory equipment. These items are no longer suitable for the lab's use. The Forensic Science Division would like to donate these items to the Washoe County School District to be used in their science programs.
The estimated value of these items is $3.650.00

FISCAL IMPACT

AGENDA rrEM
Washoe County Commission Meeting

Page2 of2

RECOMMENDATION
Approve the donation of miscellaneous used laboratory equipment from the Washoe County Sheriff s Forensic Science Division to the Washoe County School District at an estimated value of $3.650.

POSSIBLE MOTION

Approve the donation of outdated laboratory equipment from the Washoe County Sheriff s Forensic Science Division to the Washoe County School District per staff report.

Items for Donation

Copy Stand MP4 Stand (W/ Line 3) Polaroid MP 4 land Camera Eye Wash Station 2 boxes Sterlin 25X.02m1 disposable pipetter Barnstead Lab Sterillizer Damon Centrifuge VWR Vacuum Chamber EC600 VWR Power Supply 4000volt Beckman 40 pH meter Bellco Hot Shaker Box w/ metal sink(small) PC pipes & Tubing Savant VP100 two stage vacuum pump wi speed concentrator & Trap American Rotator V R4140 Tub of 1000m1 bottles (Approx 6) Varian DS 10s vacuum pump Thermal cycler DNA Thermal cycler DNA Miscellaneous Boxes of Glassware;scales and paper Triple Beam Balance from Incline Microtone & Blade Pelouze Scale Polaroid 8aX10 camera head and processor

Bar Code

None 21980

Approximate Value

$200.00 (See Above) $50.00 $10.00
None None 233837 None None None None None None
$125.00 $175.00 $175.00 $45.00 $10.00 $100.00

9700 9700

$225.00 $25.00 $10.00 $50.00 $1,000.00 $1,000.00 $100.00 $45.00 $100.00 $25.00 $125.00 $3,600.00