[rollei_list] Re: Flashbulbs

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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