[rollei_list] Re: Flashbulbs
- From: Jerry Lehrer <jerryleh@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 31 May 2005 15:31:43 -0700
John,
The F setting was used for SM bulbs.
jerry
John Jensen wrote:
> 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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