P3D Re: Realist flash sync

["Gregory J. Wageman" <gjw@xxxxxxxxxx>]

Clark "I am perplexed" writes:

> We all can agreee that the Realist syncs with electronic flash at
> all speeds.  Then how did the origional bulb flash work?  Wouldn't that
> require M sync?

Simple.  You just select a slow enough shutter speed (like 1/25th sec.) so
that the shutter remains wide open after the 20 millisecond delay time has
passed.  (The faster bulbs with the 5 millisecond delay would require
1/100th sec. or slower.)

The usual undesirable effect of such a slow shutter speed when hand-held,
camera shake, is negated by stopping down, which reduces the effect of
any ambient light.  The guide number of flash bulbs is quite high compared
to your typical hot-shoe strobe, although the duration of the flash is
much longer, relatively speaking.

At 1/100th second, the shutter is open for .010 seconds or 10 milliseconds.
At 1/25th second, the shutter is open for .040 seconds or 40 milliseconds.

    -Greg W. (gjw@xxxxxxxxxx)


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