Nikon SB-140 instruction manual Technical Information

TECHNICAL INFORMATION -continued__

Selecting/Determining Aperture

Automatic operation - for visible light only

Turn the exposure calculator dial until the number corre- sponding to the film speed is opposite the AUTO/MFULL index and you can read three usable f/stops.

Dots between the numbers on the film speed scale re- present intermediate settings.

2500 2000	1250		640 500		320 250		125	80		40		20 16	10	8
1600		1000800		400		200 160	100	64	50	32	25		12

[ffi) IQY]

Three factors should be considered in selecting a suitable f/stop-flash-to-subject distance, depth of field and recycling time.

Flash-to-subject distance

flstop indicators ® also indicate the range of flash-to- subject distances for automatic shooting. Distance ranges are constant, regardless of the film speed set on

For Manual Operation

The S8-140 offers a choice of light output, full or 1/4. Depending on the amount of light desired, set the shoot- ing mode selector of the Sensor Unit at the FULL or 1/4 position.

the dial. 0.6 m to 8 m (2 to 26 ft.) for the 0 indicator, 0.6 m to 5.6m (2 to 18ft.) for the 6 indicator, and 0.6m to 4m (2 to 13 ft.) for the 0 indicator.

For example, to shoot a subject more than 5.6m (18ft.) away, use the flstop indicated by the 0 indicator-f/4 when using ISO 100 film .

To shoot a subject more than 8m (26ft.) away, use the S8-140 on manual.

Recycling Time and Depth-ot-Field

With a subject distance that remains constant, the wider the aperture selected, the faster will be the recycling time of the flash unit, but the less the depth of field. With ISO 100 and a subject up to 4m (13ft.) away, you can select anyone of the three indicated f/stops-f/4 , f/5 .6 or f/8- taking into consideration recycling time or desired depth of field .

Visible-light flash photography

Turn the exposure calculator dial so the AUTO/MFULL index @ is opposite the film speed in use for full output, or the M1/4 @ index is opposite film speed in use for 114 output.

Read the f-number which appears directly above the flash- to-subject distance, then set this aperture on your lens. For example, to shoot a subject 2m (7ft.) away at full output with ISO 100, use fl16 . To shoot the same subject at 1/4 output, use f/8 .

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