Nikon 55 12/40 17/56 24/79 34/12 5/6.6-28 6/4.6-20 2/3.3-14, 3/2.3-9.8 2.1/2.0-6.9 1.5/2.0-4.9

•Flash shooting distance range

Flash shooting distance for the built-in Speedlight changes according to the film speed in use and aperture setting.

ISO film speed	25	50	100	200	400	800	Flash shooting
							distance range
Guide number (m/ft.)	6/20	8.5/28	12/40	17/56	24/79 34/12,		(m/ft.)	I
	-	-	1.4	2	2.8	4	2-8.5/6.6-28
	-	1.4	2	2.8	4	5.6	1.4-6/4.6-20
	1.4	2	2.8	4	5.6	8	1-4.2/3.3-14
Aperture value	2	2.8	4	5.6	8	11	0.7-3/2.3-9.8
	2.8	4	5.6	8	11	16	0.6-2.1/2.0-6.9
	4	5.6	8	11	16	22	0.6-1.5/2.0-4.9
	5.6	8	11	16	22	32	0.6-1 .1/2.0-3.6
	8	11	16	22	32	-	0.6-0.8/2.0-2.6

•The maximum flash shooting distance can also be calculated by dividing the guide number by the selected aperture value.

Example: When f/2.8 is selected with ISO 100 film using the camera's built-in Speedlight, the maximum flash shooting distance will be:

12/2.8 = approx. 4.2m or 40/2.8 = approx. 14 ft .

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