Modern Classic SLRs Series :
Nikon F2AS Photomic w/DP-12 Prism
Instruction Manual - Part IIIa

 
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Then, after completing aperture and shutter speed adjustments, recompose to the desired picture composition and make the exposure without readjusting the camera controls.

For example, when shooting landscapes, it is often advisable to aim the camera slightly downward during exposure measurement to eliminate the effects of a bright expanse of sky; without such compensation, the landscape may appear underexposed in the final print. Also, for backlit subjects, it may be necessary to move closer to the subject to ensure a proper reading.

Stopped-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, thus, preventing full aperture measurement.

StopDown.jpg
However, the camera'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).

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. If the meter indicates continuous overexposure, use a neutral density filter or slower film. If continuous underexposure is indicated, supplementary lighting or a faster film is necessary. This technique is also suitable for photography using a telescope or microscope.

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 Adjustment

Adjustments for Focusing Screens

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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 various blocks of the table on the opposite page denote the amount of correction necessary in f/stops.

Note: Light Green = Via full aperture; Green = Via Stopped Down Exposure measurement and Pink indicates Exposure measurement is not possible while lens/Screen combination permits only focusing operation; the blank space indictes lens/Screen combination cannot be used.

To adjust the camera's finder 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 mark engraved on the ring.

image11.gif
In the example figure shown, ASA 100 is aligned with the - 1/2 mark to provide the correction required when using the Type C screen with the Nikon F2AS Photomic camera and the Fisheye-Nikkor 6mm f/2.8 lens, as indicated in the table. (When "O" is indicated in the table, no compensation is required.)

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 50; 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

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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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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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