Nikon SB-28 instruction manual Specifications

Specifications

Electronic	Automatic Insulated Gate Bipolar Transistor (IGBT) and
construction	series circuitry.
Guide number								(ISO 100, m/ft)
	Flash			Zoom-head position
	output
		18mm	20mm	24mm	28mm	35mm	50mm	70mm	85mm
	level
	1/1 (full)	18/59	20/66	30/98	32/105	36/118	42/138	48/157	50/164
	1/2	12.7/42	14/46	21/69	22.5/74	25.5/84	30/98	34/112	36/118
	1/4	9/30	10/33	15/49	16/53	18/59	21/69	24/79	25/82
	1/8	6.4/21	7/23	10.5/35	11.3/37	12.7/42	15/49	17/56	18/59
	1/16	4.5/15	5/16	7.5/25	8/26	9/30	10.5/35	12/39	12.7/42
	1/32	3.2/10	3.5/11	5.3/17	5.7/19	6.4/21	7.5/25	8.5/28	9/30
	1/64	2.3/8	2.5/8	3.8/13	4/13	4.5/15	5.3/17	6.0/20	6.3/21

•See page 51 for details on guide numbers in FP High- Speed Sync Flash and see also page 30 for details on guide numbers in 1/300 TTL High-Speed Sync Flash.

Angle of	(Variable in 6 steps, plus 2-steps with built-in wide flash
coverage	adapter)
	Flash head in horizontal/front position
	Zoom-head position		Angle of coverage
		Vertical		Horizontal
	18mm (with built-in	90°		102°
	wide flash adapter in
	place)
	20mm (with built-in	85°		98°
	wide flash adapter
	in place)
	24mm	60°		78°
	28mm	53°		70°
	35mm	45°		60°
	50mm	34°		46°
	70mm	26°		36°
	85mm	23°		31°

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