Nikon N90 instruction manual 100 200 400, ISO film speed

Reference: Available maximum aperture for each film speed

ISO film speed

25	50	100	200	400	BOO	1000
112.B	113.3	1/4	1/4.B	1/5.6	1/6.7	1/7.1

As film speed increases by one step, available maximum aperture is stopped down by 112 flstop. Ifyou are using a lens with a maximum aperture smaller than listed, of course, the automatically controlled aperture range is from the lens maximum aperture to its minimum aperture (i.e., its entire range).

Note for selecting aperture

•Make sure your subject is within Ilash shooting distance range.

•The larger the aperture (the smaller the f-number) you select, the farther the maximum shooting distance, whereas the smaller the aperture (the larger the 1- number), the smaller the maximum shooting distance.

•If subject distance remains the same, the larger aperture you select, the less depth of field; however, Speedlight recycling time is shorter. On the other hand, the smaller the aperture, the greater the depth of field, but recycling time is longer.

Note for selecting shutter speed

With a slower shutter speed, a smaller aperture is automatically selected, resulting in a shorter shooting distance range.

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