Nikon SB-800 instruction manual Manual mode, Guide number ISO 100, m/ft

Manual mode

Manual mode

The SB-800 features three manual modes.

•	Distance-priority manual flash p
•	Manual flash	G
•	Repeating flash	q

You can calculate the correct aperture by using the guide number table and the shooting distance. Then set the same aperture manually on the lens.

In this case, set the camera’s exposure mode to Aperture-Priority Auto (A) or Manual (M).

•Refer to your camera’s instruction manual for details on camera and lens aperture settings.

•With the SB-800 in the Manual mode, if the camera’s exposure mode is set to other than Aperture-Priority (A) or Manual (M), the shutter may not be released, depending on the cameras in use. For details, refer to your camera’s instruction manual.

•In the Manual mode, no warning ready-light blinks to indicate that the light may have been insufficient for correct exposure after shooting.

■■■ Determining the aperture, flash output level and shooting distance in the Manual mode

In the Manual mode, use the guide number table and the following equation to calculate the aperture, flash output level, and shooting distance to obtain the correct exposure.

•The guide number (GN at ISO 100; m/ft) indicates the amount of light generated by the flash. The larger the number, the greater the flash output.

Guide number (ISO 100, m/ft)

Flash					Zoom-head position (mm)
output
level	∗1	∗2	14∗3	17∗3	24	28	35	50	70	85	105
M1/1	12.5/41	16/52	17/56	19/62	30/98	32/105	38/125	44/144	50/164	53/174	56/184
M1/2	8.8/29	11.3/37	12/39	13.4/44	21.2/70	22.6/74	26.9/88	31/102	35.4/116	37.5/123	40/131
M1/4	6.3/21	8.0/26	8.5/28	9.5/31	15.0/49	16/52	19/62	22/72	25/82	26.5/87	28/92
M1/8	4.4/14	5.7/19	6.0/20	6.7/22	10.6/35	11.3/37	13.4/44	15.6/51	17.7/58	18.7/61	19.8/65
M1/16	3.1/10	4.0/13	4.3/14	4.8/16	7.5/25	8.0/26	9.5/31	11/36	12.5/41	13.3/44	14/46
M1/32	2.2/7	2.8/9	3.0/10	3.4/11	5.3/17	6.0/20	6.7/22	7.8/26	8.8/29	9.4/31	9.9/32
M1/64	1.6/5	2.0/7	2.1/7	2.4/8	3.7/12	4.0/13	4.8/16	5.5/18	6.3/21	6.6/22	7.0/23
M1/128	1.1/4	1.4/5	1.5/5	1.7/6	2.6/8.5	2.8/9	3.4/11	3.9/13	4.4/14	4.7/15	4.9/16

*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

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