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30
EXPOSURE COMPENSATION ADJUSTMENT
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 various blocks of the table on the opposite page denote the amount of correction necessary in f/stops. 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. 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 requ ired.)
= Exposure measurement via full-aperture method.
= Exposure measurement via stop-down method.
= Exposure measurement not possible; lens/screen combination permits only focusing operation.
Blank space indicates lens/screen combination cannot be used.
Lens
Fisheye
Wideangle
Normal
Telephoto
Zoom
PC
GN
Noct
Micro
Medical
Reflex
Telephoto
Screens
6mm F2.8
8mm F2.8
16mm F3.5
13mm F5.6
15mm F5.6
18mm F4
20mm F4
24mm F2
24mm F2.8
28mm F2
28mm F2.8
28mm F3.5
35mm F1.4
35mm F2
35mm F2.8
50mm F1.4
50mm F2
55mm F1.2
85mm F1.8
85mm F2
105mm F2.5
135mm F2
135mm F2.8
135mm F3.5
180mm F2.8
200mm F4
300mm F4.5
ED 300mm F4.5
400mm F4.5
*ED 400mm F3.5
ED 400mm F5.6
600mm F5.6
*ED 600mm F5.6
Ed 600mm F5.6
800mm F8
ED 800mm F8
1200mm F11
ED1200mm F11
28~45mm F4.5
43~86mm F3.5
50~300mm F4.5
ED50~300mm F4.5
80~200mm F4.5
ED180~600mm F8
200~600mm F9.5
ED360~1200mm F11
28mm F4
35mm F2.8
45mm F2.8
58mm F1.2
55mm F3.5
105mm F4
200mm F5.6
500mm F8
1000mm F11
2000mm F11
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
A/L B C D E G1 G2 G3 G4 H1 H2 H3 H4 J K/P M R
0
0
0
0
0
0
0
0
0
0
0
0
-1/2
-1/2
-1/2
-1/2
0
0
0
0
0
0
-1/2
-1/2
-1/2
-11/2
0
0
-1
-1
0
0
0
-1
0
0
-1/2
-1/2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-1
+1/2
0
-1/2
+1/2
0
+1/2
0
0
0
+1/2
0
+1/2
+1/2
+1/2
+1/2
0
+1/2
+1/2
0
+1/2
0
-1
-1 1/2
-1
0
0
-1 1/2
-1
-1
-2
-1
-1
-1/2
-1/2
+1/2
+1/2
+1/2
+1/2
0
+1/2
+1/2
+1/2
+1/2
+1/2
+1/2
+1/2
-1/2
0
0
0
0
+1/2
0
+1/2
+1/2
0
+1/2
+1/2
0
+1/2
+1/2
+1/2
+1/2
+1/2
0
0
-1/2
-2
-1 1/2
-1/2
-1 1/2
-1 1/2
0
0
-1
-1/2
0
-1
-1/2
0
0
-1
-1/2
-1/2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* Internal focusing type
31
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