Nikon SB-800 instruction manual Flash shooting in the 1/300 TTL High-Speed Flash sync mode F5 only

Flash shooting in the 1/300 TTL High-Speed Flash sync mode (F5 only)

•The farthest flash shooting distance cannot be read on the SB-800’s LCD panel. In this case, use the guide number table and equation for calculating this distance, according to each zoom-head position.

D (farthest flash shooting distance)

= Guide number ÷ f/stop (aperture)

Guide number (m/ft.) in the 1/300 TTL High-Speed Flash sync mode

ISO				Zoom-head position (mm)
sensitivity	∗1	∗2	14∗3	17∗3	24	28	35	50	70	85	105
25	2.5/8	3/10	3.5/11	3.5/11	5.5/18	6/20	7/23	8/26	9/30	9.5/31	10/33
50	3.6/12	4.3/14	5/16	5/16	7.8/26	8.5/28	9.9/32	11.4/37	12.8/42	13.5/44	14.2/47
100	5/16	6/20	7/23	7/23	11/36	12/39	14/46	16/52	18/59	19/62	20/66
200	7/23	8.4/28	9.8/32	9.8/32	15.4/51	16.8/55	19.6/64	22.4/73	25.2/83	26.6/87	28/92
400	10/33	12/39	14/46	14/46	22/72	24/79	28/92	32/105	36/118	38/125	40/131
800	14/46	16.8/55	19.6/64	19.6/64	30.8/101	33.6/110	39.2/129	44.8/147	50.4/165	53.2/174	56/184

∗1 With the Nikon Diffusion Dome attached and the wide-flash adapter in place

∗2 With the Nikon Diffusion Dome attached ∗3 With the wide-flash adapter in place

•For example, when shooting with an ISO sensitivity of 100, at a 35mm zoom-head position and an aperture of f/5.6:

D = 14 ÷ 5.6 (f/stop) = 2.5 (in meters) (farthest flash shooting distance)

D = 46 ÷ 5.6 (f/stop) = 8.2 (in feet) (farthest flash shooting distance)

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