[rollei_list] Re: Flashbulbs
- From: Jerry Lehrer <jerryleh@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 31 May 2005 15:29:09 -0700
Don,
You are right. The "F" setting was for a short delay to peak light,
5 milliseconds, as opposed to 20 ms. for regular bulbs. The FP
bulbs were for focal plan shutters.
Jerry
Don Williams 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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