Analog Photography by Andrew Bellamy

Author:Andrew Bellamy
Language: eng
Format: epub
Publisher: Princeton Architectural Press
Published: 2019-11-30T16:00:00+00:00

Flash Sync(hronization)

063 Leaf Shutters

119 Rangefinder

067 Focal-Plane Shutters

068 Shutter Speed

119 Rangefinders & SLRs

Some flashes have a delay (time lag) before reaching the peak of their light output. To function properly, flashes therefore need to be synchronized precisely to the opening of the shutter. When using a flash with a leaf shutter rangefinder, it is important to select the correct setting for full synchronisation at all shutter speeds. The flash setting selector should be changed to M, F, or X, according to the flash type. Unless you have found some obsolete bulbs at auction, it’s more than likely today that you will be using an electronic flash (X).

M (medium) flash bulbs

Twenty-millisecond delay between the start of the flash and the shutter opening fully, to allow the bulb to reach peak brightness before exposing the film.

F (fast) flash bulbs

Five-millisecond delay between the start of the flash and the shutter opening fully, to allow the bulb to reach peak brightness before exposing the film.

X (xenon) electronic flash

Zero time delay; flash responds instantly and coincides exactly when the shutter is fully open.

Note that leaf shutters have an extra speed-governing mechanism which synchronizes delay at the M and F positions. This mechanism can put stress on the shutter, but it is not engaged at the X position. The shutter can therefore be saved from extra wear by keeping the flash setting selector at X.

Focal-plane shutter cameras may have another flash setting labelled FP, for focal plane flash or flat-peak bulbs, designed specifically for use with focal-plane shutters. They only generally sync with the flash at one or two shutter speeds, commonly 1/60 or 1/125; this is the sync speed. The sync speed is the fastest shutter speed that can be used with flash. On an SLR it is often highlighted in red on the shutter speed dial.

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