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Nikon F2AS Photomic Finder DP-12 - Index Page

 

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Nikon DP12 metered finder prism for Nikon F2AS SLR camera
FOREWORD

The Nikon F2AS Photomic Finder DP-12 is a compact, precision pentaprism finder assembly designed to fit any F2 Nikon camera body. The DP-12 incorporates the Nikon center-weighted thru-the-lens metering method that concentrates 60% of the reading within the 12 mm-diameter central portion of the view field; thus, metering is precise for varied lighting situations, and covers virtually 100% of the picture image frame as visible on the focusing screen.

One outstanding new feature with the DP-12 is the provision for operation with the new Nikkor lenses capable of automatic maximum aperture indexing during mounting on the camera body. The meter coupling lever provided on the DP-12 engages the meter coupling ridge provided on these new lenses to provide for lens/meter coupling and automatic indexing of the lens' maximum aperture.
Credit: Image(s) courtesy of some nice folks from DigifanCN®. The group also operates their own active, popular EBAY STORE, trading for many major camera brands and collectibles. Image Copyright © 2008. All rights reserved. Please respect the visual property of the contributing photographer.

And the DP-12 is also fitted with a small viewing prism at the base of the front plate to provide for aperture-direct-readout (ADR) from the scale provided on the lens. Note: ADR feature is part of an "AI-spec" (Automatic Maxiumum Aperture Indexing) Nikkor lens.

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Other merits of the DP-12 include the advanced triple LED, five-step exposure display, the external LED indicator for use with the built-in eyepiece shutter, advanced silicon photodiode (SPD) for sensitive metering even to EV -2 low-light conditions. The display of the shutter speed setting (as well as the aperture setting previously mentioned) within the finder, full usability for both full-aperture and stop-down measurement as required, threaded eyepiece frame for attaching various viewing aids, and the readylight built into the eyepiece for convenience when operating with flash units. To ensure you get the best results from your F2AS Photomic Finder DP-12, read the content in this site carefully or print a copy for your future reference until you have thoroughly familiarized yourself with the unit and its operation.

Nikon system (download a PDF File (700k) of Nikon system as at Nikon f2AS)

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Foreword . . . . . Preparation for use . . . . . . Attaching the finder . . . . . Shutter speed coupling . . . . . Removing the finder . . . . . . Coupling lever lock/release operation .... Setting the film speed . . . . . Installing the batteries . . . . . Checking the batteries . . . . . Eyepiece ready-light . .

Exposure measurement . . . . . . Determining exposure . . . . . . . Metering range . . . . . . . High-contrast lighting situations . . . Extreme low-light metering . . . . . . Eyepiece shutter operation . . . . . . Finder illuminator . . . Stop-down exposure measurement . . . . Exposure compensation adjustments . . . Adjustments for focusing screens . . . Adjustments for film compensation ........... Care, maintenance and handling . . . . . . Accessories for Finder. . . . . .DS-12, Eyecup, Eyepiece
Specifications . .

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BEFOFE you proceed with the rest of the content baked for you in this site, it will be easier for you to click open a new window with a copy of the Main Reference Map and see if it is useful for your reference.
Note: Off-topic discussion for Nikon Meter and non-Metered Prisms are also available at: the Index Page (10 Parts)

Preparation to use the Finder:

Attaching the Finder

The F2AS Photomic Finder DP-12 attaches to any F2 Nikon camera body without the need for modifications or adjustments, and provides for automatic maximum aperture indexing and full-aperture exposure measurement (via the built-in coupling lever) with all Nikkor lenses fitted with a meter coupling ridge. Additionally, the DP-12 can be mounted on the camera body at any time either before or after the lens is attached.

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If a lens fitted with a meter coupling ridge (i.e., Al or modified Nikkor) is already mounted on the camera body prior to attaching the finder, first check that the finder's coupling lever is released. Place the finder in the mounting position, then press it gently but firmly until it clicks and locks into place. Ensure that the finder mounting clamps engage the seating pins on the camera body. Then, set the lens to the maximum aperture and slide the coupling lever release to the left (facing the camera) to assure positive meter/lens coupling. Lastly, check that the meter and lens are properly coupled.

If the finder is to be used with a lens not fitted with a meter coupling ridge, mount the finder as follows: Lock the meter coupling lever in the up position (see "Coupling Lever Lock/Release Operation" section for more details), position the finder for mounting and, then, press it downward until it clicks and locks into place; again, be sure to press firmly to ensure proper engagement with the seating pins. Note that operation with lenses not fitted with a meter coupling ridge will require step-down exposure measurement.

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Shutter Speed Coupling

The shutter-speed selector of the DP-12 finder is part of an extender assembly that couples with the camera's shutter-speed dial. After mounting the DP-12 on the camera, turn the selector left or right until it engages with the camera's shutter-speed dial and the two can be turned in tandem.

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Removing the Finder

To remove the DP-12 from the camera, press the finder release lever inward and rotate toward the front (this action releases the mounting clamps); then, depress the finder release button at the rear of the camera body and lift the finder out of the camera.

Coupling Lever Lock/Release Operation

The DP-12 finder is fitted with a meter coupling [ever that provides for coupling between the finder's metering circuit and the lens' meter coupling ridge. When the camera body is used with lenses offering automatic maximum aperture indexing, the lever remains in the normal position. However, when the camera body is used with lenses and/or accessories not provided with this feature, the lever must be locked up to permit exposure measurement via the stop-down method.

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To lock up the lever prior to mounting the lens, simply push the lever upward and to the right until it clicks and locks into position.

To release the lever for operation with a lens or accessory capable of automatic maximum aperture indexing, simply slide the coupling lever release (located just above the lever) to the right until the lever returns to its normal lowered position; then, mount the lens or accessory as normal.

Setting the Film Speed

The exposure meter of the DP-12 must be adjusted to the peed of the film in use to ensure correct exposure; thus, a film-speed scale (ASA graduations) and an index ring are provided on the finder. To adjust, lift up the milled ASA film-speed index ring and turn it until the red index triangle is aligned with the ASA value for the film in use.

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The meter can be set across the full range of from ASA 12 to ASA 6400. The film-speed dial has two dots between each pair of numbers for intermediate settings such as 64, 80, 125, etc.



Installing the Batteries
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The F2AS Photomic Finder DP-12 is powered by two highperformance silver-oxide batteries loaded in the battery chamber in the baseplate of the camera. To install the batteries, first remove the battery chamber cover (turn it 90° counterclockwise using a coin or similar object); then, place two 1.5V silver-oxide (button-cell type) batteries in the chamber, making sure that the plus (+) side of each unit faces out.

After inserting and properly seating the batteries, replace the cover and lock it to secure the assembly.

Caution: Remove the batteries when the camera is not to be used for a long period. At below-freezing temperatures, the batteries may malnction or cease to operate until the temperature rises again. Be careful not to expose them to severe cold for long periods.

Checking the Batteries

The F2AS Photomic Finder DP-12 is powered by two highperformance silver-oxide batteries loaded in the battery chamber in the baseplate of the camera. To install the batteries, first remove the battery chamber cover (turn it 90' counterclockwise using a coin or similar object); then, place two 1.5V silver-oxide (button-cell type) batteries in the chamber, making sure that the plus (+) side of each unit faces out.

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The camera's film-advance lever serves as the ON/OFF switch for the DP-12 finder. To check battery power, perform the following: Pull out the lever just far enough to uncover the red meter ON index on the top of the camera; then, look within the finder to see if any of the LED exposure indicators are illuminated. If any of the indicators are lit, battery power is sufficient for proper operation. If none of the LED's light, battery positioning should be checked; then, if the LED's still fail to light, replace batteries.

Caution: Whenever the camera is stored, be sure that the film-advance lever is set in the meter OFF position (i.e., flush to the body); failure to observe this precaution can result in total battery drain in a matter of days due to continuous illumination of one or more of the finder's LED indicators.

Nikon DP12 metered finder prism for Nikon F2AS SLR camera rear section view
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Credit: Image(s) courtesy of some nice folks from DigifanCN®. The group also operates their own active, popular EBAY STORE, trading for many major camera brands and collectibles. Image Copyright © 2008. All rights reserved. Please respect the visual property of the contributing photographer.

System Accessories: Motor Drives / Prisms / Screens / Macro / Film Backs / Flash Other Accessories: DS-1 / DS-2 / DS-12 / eyepiece / DH-1 / cases / Cable releases / Miscellaneous
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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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