Nikon F25B manual Exposure Compensation Adjustments

EXPOSURE COMPENSATION ADJUSTMENTS-continued

Adjustments for Film Compensation

Some exposure correction may be necessary when cer- tain types of films are used for copying or photomicro- graphy applications; the amount of correction requ ired, however, will depend on the type of fi lm and the spe- cific ap plication . The fol lowing table li sts 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 fi lm -speed index ring. In the exa mpl e shown, the index ring is set so that the red mark is aligned with ASA 50; this sett ing is the correct position to achieve a one-stop increase in ex posure (three scale grad ua tions equ al one sto p) as requ ired wh en performing photomicrography (see table) using ASA 100 Panchromatic film.

I~	Repro-copying & slide-copying
	B&W	Letters or figures letters or figures		Photo·
Type				micrography
		on	on
	color photo
offilm		light background	dark background
Panchromatic	No	+1 Y2 stops	- Y2 stop	+1 stop
film	compensation
for general use	necessary

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