Modern Classic SLR Series
Nikon EE Aperture Control Attachment Unit DS-12
for Nikon F2AS camera Model
Part II

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Removing the Attachment

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Depress the button on the A-M switch lever so that the lever, if at the A position, springs to the M setting. Continue depressing the button and turn the lens clockwise to the limit of its travel to remove the lens from the camera. Push the meter coupling lever to the 'up' position. Then loosen the lock knob on the attachment and slide it off the camera body.

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Automatic Exposure Control (AE)

A-M Switch Lever

The A-M switch lever sets the DS-12 for either automatic or.manual exposure metering control. To set it at automatic, push the lever upward until it clicks into place with the white dot aligned with the "A" (Auto) mark.

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To override it for manual control, depress the button and the lever springs back to the M setting. This stops the servo action of the attachment, and you can manually set any desired aperture on the lens aperture scale.


Automatic Metering

Position the A-M switch lever at automatic. Set the desired shutter speed by turning the selector until the desired speed appears opposite the white dot. Depress the ON/OFF button on the side of the attachment; you will hear the attachment buzzing and will see the LED display in the viewfinder light up. This indicates that the servomotor is working to adjust the lens diaphragm for the correct aperture.

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Keep the ON/OFF button depressed; when the proper aperture for the selected shutter speed has been obtained, the sound will stop, and the LED display will indicate correct exposure. In the viewfinder you will see the selected aperture and shutter speed. When another combination is desired, reset the shutter speed and the attachment will adjust again for the right aperture.

The range of usable f/numbers is from the minimum to the maximum aperture of the lens in use. For example, with the 50mm f/1.4 lens, the range is from f/16 to f/1.4. The servomotor stops automatically when the drive gear reaches either of these limits. Change the shutter speed until the servomotor starts to move. If the attachment does not move again after all shutter speeds have been tried, then the light is too bright or too dim to cover the automatic metering range. Switch to a new film that matches the available light or mount a neutral density filter onto the lens to cut down on the amount of light or use artificial lighting to increase the luminosity.

Using the EE attachment with the DP-12 finder for automatic operation at very low light levels may result in "hunting"; the lens aperture oscillates through a range of one to two f-stops, and the LED display flashes intermittently. This indicates that the subject is out of automatic metering range, and you should switch over to manual operation.
Note: When the servo-drive nears the end of its travel, a safety cutoff will stop the mechanism just short of either the maxi~ mum or minimum aperture of the lens to avoid overload.

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Run-Control Switch For rapid shooting with or without the motor drive and for motor-driven remote-control photography, the run-control switch locks the DS-12 attachment for continuous automatic metering. Locked in this position, the servo-motor automatically and continually changes the aperture setting with any lighting variations to insure correct exposures. To lock the attachment for continuous metering, depress the ON/OFF button on the run-control switch and turn the switch down until the ON mark is opposite the black dot.

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Manual Operations For manual operation using the camera's metering system for exposure determination, first switch on the power and set the A-M switch lever at the M position. Now you can make your own plus or minus exposure selections for unusual subjects or lighting situations, or for creative control of the subject. Manual control also allows you to maintain a desired f/number.

Note: When the DS-12 equipped camera is used with flash, the A-M switch lever is set to "M"; the aperture is selected manually. A shutter speed suitable for the type of flash to be used should also be set.

Motor Drive Operations The use of the DS-12 on a motor-drive-equipped Nikon F2AS Photomic camera body provides an exceptionally high level of operation convenience for almost fully automatic photography. To ensure the best results,
observe the following operational steps carefully.

Single-frame operation, continuous exposures at low motor drive speeds, and short bursts at higher speeds all generally present no problem for proper DS-12 operation. However, long bursts at higher speeds (i.e., more than approximately 5 frames at M2 ~ M3) may be somewhat overexposed unless precautions are taken. In these cases, manually reduce the exposure setting by 1/3-stop (e.g., with ASA 100, set the film speed dial to "125") before shooting.

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If the available light is uniform, it is advisable to de-activate the DS-12 and set the unit's A-M switch to the manual (M) setting. When exposure compensation is made as described above, the first 1~2 frames may be somewhat underexposed. Be sure to consider this when beginning the shooting sequence. The time required for the DS-12 to respond to a sudden change in subject illumination is lengthened when shooting at higher motor drive speeds, because the camera's rapid cycling frequently interrupts the DS-12's servo action. As a result, some frames may be overexposed (or underexposed) if filming is performed under these circumstances. When remote-control motorized photography is performed, it is advisable to cover the camera's viewfinder (with the DP-12, close the eyepiece shutter); to prevent the entry of stray light. If this precaution is not taken, incorrect exposure may result.

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Recharging the NiCd battery The Nikon Quick Charger DH-1 recharges a completely exhausted NiCd Battery DN-1 to about 80% capacity in a brief three hours. It has a voltage selector for inputs of 100, 117, 220 and 240V.

Setting the Proper Voltage First, set the voltage selector on the back of the Quick Charger to the right voltage. This is done by inserting a small coin or similar object into the slot of the voltage selector and turning it so that the red dot is opposite the correct 100, 117, 220 or 240V setting.| Previous | Next | 2 / 3 Some handy system accessories and specifications

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Recommended links to understand more technical details related to the Nikkor F-mount and production Serial Number:
http://rick_oleson.tripod.com/index-153.html by: my friend, Rick Oleson
http://www.zi.ku.dk/personal/lhhansen/photo/fmount.htm by: Hansen, Lars Holst
http://www.mir.com.my/rb/photography/hardwares/nikonfmount/lens2.htm
http://www.photosynthesis.co.nz/nikon/serialno.html

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Copyright © 2000. leofoo ®. MIR Web Development Team.

In memory of my friend Com. Augusto Staut, Brazil, 1971-2000.

Credit: Chuck Hester, US for his patience, encouragement and help to setup the various content in this site; Robert Johnson for some of his original images on the F2H-MD appeared in this site; my ex-staff, KiaSu for his superb 3-D logo appeared in this Nikon F2 site; Marc Vorgers from Holland who generously provide me with some of his images of F2AS; MCLau®, who has so much time with me to re-edit the content in this site and not to mention buying a Nikon Coolpix 990 just for this site. Keat Photo, Kuala Lumpur for providing their Nikon F2A to take some images for this site; again, Mr Edward Ngoh the great camera collector who provides us his collection of F2AS with MD-2; hawkeye.photographic.com for their images on the Speed Magny film backs; Sean Cranor for his image on Nikon F2 25th Anniversary Model; Ted Wengelaar®, Holland for his continuous flow of input on some of the early Nikon bodies; CYLeow ® , photo editor of the Star newspaper, Malaysia for some of his images used in this site. Ms Rissa Chan, Sales manager from Shriro Malaysia who has helped to provide some of the very useful input. HiuraShinsaku®, Nikomat ML, Japan for some of his images on various F2 models; my staff, Wati, Maisa, Mai and my nephew, EEWyn®, who volunteered and helping me did so many of the film scanning works. Contributing photographers or resellers: Jen Siow, Foo KokKin, Arthur Teng, Mark Fallander, John Ishii, Ed Hassel, YoonKi Kim, Jean-Louis, M.Dugentas (Dell Corner.com.), Mr "Arsenall" and a few images mailed in from surfers with no appropriate reference to their origin. Dedicated to KU Yeo, just to express our mutual regrets over the outcome of a recent corporate event. Made with a PowerMac, broadcast with a Redhat Linux powered server.

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