Nikon 58-104 manual Guide number at various film speed Light, Output

In manual mode. you can determine the correct flstop using the following equation:

flstop = __-g"ui_de _number__ flash -to-subject distance

See table below for the guide number at various film speed.

	Guide number at various film speed														m (ft)
	Light					Underwater shooting
	output	18025	50		64		100		200		400		800		1000
	M Full	8 (26)	11 (36)		12	(39)	16	(53)	22 (72)		32	(105)	45	(148)	50 (164)
	M 1/4	4 (13)	5.6	(18)	6	(20)	8	(26)	11 (36)		16	(53)	22	(72)	25 (82)
	M 1/16	2 (7)	2.8 (9)		3	(10)	4	(13)	5.6 (18)		8	(26)	11	(36)	12 (39)
															m (tt)
I	Light						On-land shooting
	output	18025	50		64		100		200		400		800		1000
	M Full	16 (52)	22	(72)	25 (82)		32	(105)	45	(148)	64	(210)	90	(295) 101 (331)
	M 1/4	8 (26)	11 (36)		12	(39)	16	(52)	22	(72)	32	(105)	45	(148)	50 (164)
	M 1/16	4 (13)	5.6	(18)	6	(20)	8	(26)	11	(36)	16 (52)		22	(72)	25 (82)

_ Caution

-Guide numbers under water vary according to water conditions.

-When aiming the Speedlight diagonally. open the aperture 1/2 to 1 step wider (smaller f-number) than the aperture value obtained in the

above equation to compensate for the different angle of reflection . _ When taking photographs with the arm removed from the bracket .

Nikon recommends you to take various pictures with different apertures by adjusting the camera-to-subject distance.

• Important

If the camera-to-subject distance is actually measured underwater. multiply the measured distance by 3/4 to get the estimated distance underwater.

For example. if the actual camera-to-subject distance is 1.33 meters (4.3 feet). set the lens distance scale to 1 meter (3.3 feet). and read the "1 meter" column on the exposure calculation chart.

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