[rollei_list] Re: Flashbulbs

My vague recollection is that M is 15-20 milliseconds
delay, F about 5 milliseconds, and X zero
milliseconds.

The purpose of the F bulbs was for a short lighting
time for action shots (not as quick as an electronic
flash, however).

John

--- Don Williams <dwilli10@xxxxxxxxxx> wrote:
> At 12:16 PM 5/31/2005, Richard wrote:
> >   The GE No.50 and Sylvania No.3 were meant to be
> used in
> >studio reflectors with very slow shutter speeds
> (1/25th or
> >longer) or open flash. A single bulb in a 12"
> reflector has
> >a guide number of 600 for ISO-100 film. Thats f/6
> at 100
> >feet folks, try that with your stobe units.
> Remember, these
> >are bulbs about the size of 150 Watt household
> lamp.
> Was that the purpose of the "M" flash setting.  I
> had cameras which had "F" 
> and "M" flash settings.
> 
> It seems to me that the "F" wasn't related to focal
> plane shutters but I'm 
> not sure.  I think it was another flashbulb setting.
> 
> I had to grind a new cam to change the "F" setting
> on an old Argus to make 
> it "X", which was for strobes.
> 
> Anyone have any recollection about this?
> 
> 
> 
> Don Williams
> La Jolla, CA
> 
> 
> 
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