Modern Classic SLRs Series :
Nikon F2AS Photomic Finder DP-12 - Part III

 

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STOP-DOWN EXPOSURE MEASUREMENT

With some Nikkor lenses, full-aperture exposure measurement is not possible, either because the lens has no automatic diaphragm, or because the lens does not couple with the finder's meter; with certain accessories, too, lens/ finder coupling is not possible. However, the DP-12's Photomic meter can still be used for exposure measurement via the stop-down method. Before mounting the lens (or accessory) on the camera body, push the meter coupling lever up and to the right; with this action, the lever will remain locked up for stop-down exposure measurement (to release the lever after removing the lens/accessory push the release to the right as described in "Coupling Lever Lock/Release Operation").

Meterlever.jpg

When the coupling lever is in the locked-up position, the f/number visible in the view field will turn "reddish", indicating that the exposure meter of the camera and the lens are not coupled.After setting the finder, mount the lens or lens/ accessory combination on the camera, switch on the meter by moving the film-advance lever to the standoff position, and then set the controls for correct exposure as follows: For automatic diaphragm lenses with no coupling ridge, set the camera to the desired shutter speed; then, depress the depth-of-field preview button to stop down the lens diaphragm and, while holding the button depressed, adjust the aperture ring until the center LED indicator comes on. Be sure to release the depth-of-field button prior to making the exposure.



For fixed-aperture lenses, such as Reflex-Nikkor lenses, simply adjust the shutter-speed selector until the center LED indicator comes on. For convenience, shutter speeds can be set at intermediate settings in the 1/80 sec. to 1/2000 sec. speed range for precise exposures. The exposure can additionally be controlled via built-in or accessory ND filters.

For bellows units, extension rings and preset lenses, set the camera to the desired shutter speed; then, stop down the lens manually until the center LED indicator comes on. Preset-type lenses include PC-Nikkor lenses.

EXPOSURE COMPENSATION ADJUSTMENTS

Adjustments for Focusing Screens Light transmission properties vary somewhat with focusing screen type, thus occasionally requiring exposure correction to compensate for the combined effects of the lens/screen combination in use. The numbers listed in the various blocks of the table on the opposite page denote the amount of correction necessary in f/stops.

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To adjust the DP-12 for the indicated f/stop correction, lift and turn the ASA film-speed index ring until the ASA value for the film in use is aligned with the appropriate m , ark engraved on the ring. In the example figure shown, ASA 100 is aligned with the -Y2 mark to provide the correction required when using the Type C screen with a DP-12 Photomic Finder-equipped F2 Nikon camera and the Fisheye-Nikkor 6mm f/2.8 lens.

Adjustments for Film Compensation Some exposure correction may be necessary when certain types of films are used for copying or photomicrography applications; the amount of correction required, however, will depend on the type of film and the specific application. The following table lists the exposure corrections in f/stops required for various film/shooting requirements.

Compensation is possible by adjusting the shutter speed or the aperture by the indicated amount; also, compensation is possible by adjusting the ASA film speed index ring. In the example shown, the index ring is set so that the red mark is aligned with ASA SO; this setting is the correct position to achieve a one-stop increase in exposure (three scale graduations equal one stop) as required when performing photomicrography (see table) using ASA 100 panchromatic film.

Original/Type of Film

Repro/Slide Copying

B/W/Color

Letters/Figures on Light Background

Letters/Figures on Dark Background

Photomicrography

Panchromatic Film for general use

No compensation required

+ 1-1/2 Stop

- 1/2 Stop

+ 1 Stop

Care, Maintenance and Handling

Your F2AS Photomic Finder DIP-12 is durable.
However, it also deserves the same care you would give any precision instrument. Follow the simple precautions given below and the finder will give you many years of dependable performance.

Always attach or remove the finder properly. Do not use excessive force in either case.
When not in use, store the finder with a prism guard in a case. Avoid storing it where it is liable to be exposed to excessive heat, cold or dampness.
Avoid fingerprints and dust on the prism surface. Brush away grit with a soft brush or use a rubber lens blower. Do not use cloth or ordinary tissue. If smudges or fingerprints persist, use a lens tissue sparingly dabbed with a professionally-recommended lens cleaner. Wipe with a circular motion and gentle pressure. (Even an approved lens cleaner can cause damage if it seeps into the prism mount.)
When it is not being used for a long period, check the finder periodically to see that it operates properly.
Before leaving for a holiday, make a few trial exposures and allow at least two or three weeks' time for film processing and making any needed repairs or adjustments.

ACCESSORIES for Finder

Nikon F2AS DS12.jpg
EE Aperture Control Attachment DS-12

Specially designed for operation with F2AS-finder equipped F2 Nikon cameras and Al-type Nikkor lenses, the EE Aperture Control Attachment DS-12 brings the F2 user the convenience of automatic aperture control. With the DS-12, the photographer is free to concentrate fully on the subject while the attachment's built-in servo mechanism is automatically adjusting the aperture setting as necessary for perfectly exposed photographs under even changing lighting conditions.

Power for DS-12 operation is via any of three optional power sources. Instruction of | how to use | the EE Aperture Control Attachment DS-12

Finder Eyecup

eyecup.jpg
The soft rubber finder eyecup screws directly onto the finder eyepiece to Prevent extraneous light from entering the viewfinder. When using an eyepiece correction lens with a finder eyecup, it is recommended to use the Nikkormat type eyecup. First, fit the lens into the eyecup in advance. Then screw the assembly onto the finder eyepiece.


Eyepiece Correction Lenses

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The nine eyepiece correction lenses are designed to permit nearsighted and farsighted users to view and focus without their glasses. Available in -2, -3, -4, -5, 0, +0.5, +1, +2 and +3 diopters, each representing the combined dioptre of the lens and the finder. Simply screw into the finder eyepiece.

Specifications:

Type of unit: Interchangeable eye level pentaprism type finder with built-in exposure meter for F2 Nikon cameras; no modification or adjustment required for mounting
Exposure measurement: Thru-the-lens (TTL) Centre-Weighted system; both full-aperture and stop-down measurement possible
Exposure indication: Via three light-emitting diodes (LED) within the finder and one atop the prism
Film speed range: ASA 12 - 6400
Metering range: EV -2 to EV 17 (f/1.4 at 8 sec. to f/8 at 1/2000 sec.) with 50mm f/1.4 lens and ASA 100

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Aperture coupling: f/1.2 - f/32; meter coupling lever provided for coupling and automatic maximum aperture indexing with AI Nikkor lenses
Shutter speed coupling
: 1 - 1/2000 sec. via direct coupling; longer settings of from 2 sec. to 10 sec. via self-timer operation

Meter ON switch: Built into camera's film-advance lever
Power source: Two 1.5V (button-cell type) silver-oxide .batteries mounted in camera body
Dimensions: Approx. 78mm x 42.5mm x 64.5mm
Weight: Approx. 220g
Accessories included: Plastic prism guard

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The Eyes of Nikon:-
Nippon Kogaku KK Rangefinder RF-Nikkor lenses:- Main Index Page
Nikon Auto Focus Nikkor lenses:- Main Index Page
Nikon Manual Focus Nikkor lenses- Main Index Page

Fisheye-Nikkor Lenses - Circular | Full Frame | Ultrawides Lenses - 13mm15mm18mm20mm | Wideangle Lenses - 24mm28mm35mm |
Standard
Lenses -
45mm 50mm 58mm | Telephoto Lenses - 85mm105mm135mm180mm & 200mm |
Super-Telephoto
Lenses - 300mm 400mm 500mm 600mm 800mm 1200mm |
Special Application lenses:
Micro-Nikkor Lenses - 50mm~55mm -60mm 85mm -105mm 200mm Micro-Zoom 70-180mm
Perspective Control (PC) - 28mm 35mm PC-Micro 85mm
Dedicated Lenses for Nikon F3AF: AF 80mm f/2.8 | AF 200mm f/3.5 EDIF
Depth of Field Control (DC): 105mm 135mm
Medical Nikkor: 120mm 200mm
Reflex-Nikkor Lenses - 500mm 1000mm 2000mm
Others: Noct Nikkor | OP-Nikkor | UV Nikkor 55mm 105mm | Focusing Units | Bellows-Nikkor 105mm 135mm
Nikon Series E Lenses: 28mm35mm50mm100mm135mm | E-Series Zoom lenses: 36~72mm75~150mm70~210mm
MF Zoom-Nikkor Lenses: 25~50mm | 28~45mm | 28~50mm | 28~85mm | 35~70mm | 36~72mm E | 35~85mm | 35~105mm | 35~135mm |
35~200mm | 43~86mm | 50~135mm | 50~300mm | 70~210mm E | 75~150mm E | 80~200mm | 85~250mm |
100~300mm | 180~600mm | 200~400mm | 200~600mm | 360~1200mm | 1200~1700mm

Tele-Converters: TC-1 | TC-2 | TC-200 | TC-201 | TC-300 | TC-301 | TC-14 | TC-14A | TC-14B | TC-14C | TC-14E | TC-16 | TC-16A | TC-20E

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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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