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

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The DS-12 EE Aperture Control Attachment is designed to provide the DP-12 Photomic Finder equipped F2 Nikon camera with shutter-speed priority, automatic exposure capability.

Utilizing the Photomic finder's meter readings of the subject's brightness, the DS-12 continuously adjusts the lens aperture to maintain correct exposure. Its automatic exposure control functions at all shutter speeds, and couples with virtually all Nikkor lenses offering the Al facility. Provision for manual override makes for flexibility of use. When used with the Nikon motor drive and intervalometer, a DS-12 equipped camera permits fully automatic, unmanned operation. Connection with the da/aback-equipped cameras through the flash terminal, allows recording of time and date on the film frame.

To obtain the best results from your DS-12 Aperture Control Attachment, read these instructions carefully before using the unit. Keep the booklet handy for quick reference until you have fully mastered operation. A few minutes of preparation will help you avoid costly mistakes.


Foreword ........
Setting up the Attachment ..... Installing the battery ....... Checking the battery ....... Removing the attachment .... Automatic Exposure Control: A-M switch lever .......... Automatic metering ......... Run-control switch .......... Manual Operation ............ Motor Drive Operation ........ Recharging the NiCd battery .... Setting the proper voltage..... Charging the battery ..... Accessories....... AC/DC Converter MA-4....... Battery Pack DB-1 ..... Nikon F2 36/250-Exposure Data Camera Set ...... Mounting Modified 85mm & 105mm Lenses ........ Specifications ....... Check Lists for proper EE control operation . .

Note: Before proceeding, click open a new window for a page on Main Reference Map

Setting up the Attachment Unit

Remove the lens and F2AS Photomic finder from the camera and pull up the camera rewind knob as far as it will go. Before mounting the DS-12 attachment, make sure that its A-M switch lever is set at the M position. If not, push down on the button and the lever will spring to the M setting.

Setup1.jpg (8k) lOading... DS-12 setup2.jpg
Slide the attachment into place, with the fork sliding into the accessory shoe and the loop arm settling around the lens bayonet mount. Turn the milled lock knob on the attachment until you feel an increased tension. The attachment is now locked in place.

(Note: the knob can still be turned; this leeway prevents over-screwing of the knob thread into the sync terminal on the camera.)

Then mount the finder on the camera (refer to the instruction manual for the F2AS Photomic) in the normal way; this action will connect the circuitry of the finder and the DS-12 via the electrical contacts provided on each of the units.

An alternative technique for mounting the DS-12 permits the finder to be left in place on the camera body. Merely push the finder's meter coupling lever into the 'up' position and slide the DS-12 onto the camera body in the normal way. Return the meter coupling lever to the normal position when the attachment is mounted. Although this technique speeds up attachment under field conditions where it may not be possible or practicable to remove the finder, it is not recommended as a normal practice since it causes wear and tear on the contacts on both the finder and the DS-12.

Push the drive gear on the loop arm up as far as it will go. Set the lens to be mounted at its minimum aperture (e.g., in the case of a 50mm f/1.4 lens, the minimum aperture is f/16). This will position the lens' EE Servo Coupling Post for correct engagement with the drive gear when the lens is mounted.

ds12setup4.jpg ds12setup5.jpg
Position the lens in the camera's bayonet mount, aligning the respective indices. Twist the lens counterclockwise until it clicks into place.

You should only use Nikkor lenses offering the "Al" facility with the DS-12; attempting to mount other lenses could damage the lens or attachment or both. For other models: Nikon F2S uses DS-1, F2SB takes DS-2 while another AI F2, i.e. F2A, the correct EE Aperture Control attachment unit is DS-11.


1 ) Please note that the physical size of the 13mm f/5.6 Nikkor prevents it from being mounted on the camera when the DS-12 is attached.
2) As the bellows attachments and extension rings are not provided with EE Servo Coupling Posts they cannot be used in conjunction with the DS-12.
3) You may occasionally experience difficulty in mounting 85mm and 105mm Nikkors which have been modified to provide the Al facility. If this occurs please refer to the following sections for further details.

4) Secure the EE Aperture Control Attachment by tightening the lock knob. If the knob is loose, imperfect circuit contact may result, or the unit may become deformed.
5) Ensure that the finder's meter coupling lever is correctly positioned with respect to the ridge on the lens.

6) Make sure that the drive gear and the EE Servo Coupling Post have engaged correctly.
7) When you load a camera to which the EE Aperture Control unit has been attached, observe the following. First drop a film cartridge in place. Then, turning the rewind knob clockwise, push it down so that the cylinder round the shaft goes down to hold the cartridge; otherwise, the film cannot be rewound.

8) When carrying the camera/attachment assembly around, especially with a long lens, always hold the camera bodynever the attachment.

Installing the Battery

Unscrew the large milled cap on the attachment and place the NiCd Battery DN-1 (available as an option) into the battery well. Be sure that the plus (+) side faces out. If the battery is inserted in the wrong direction, the cap cannot be replaced.

Note: The battery DN-1 is fully charged. However, even if the battery is not used, there may be some battery drain after a time lapse. Recharging will restore it to full capacity.

Checking the Battery

A built-in battery checker lets you check the condition of the battery at a glance. Turn the run-control/power check switch down until the CH mark is opposite the black dot, and watch the lamp on the top deck. If the lamp comes on with a bright light, the battery is in good condition.

When the attachment is mounted on the camera, the Photomic finder's meter is powered by the battery in the DS-12. The batteries in the camera body are not used and the switch on the film advance lever serves no function.

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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; 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, 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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