[rollei_list] Re: Flashbulbs

At 06:02 PM 5/31/2005, Allen Zak wrote:
>At 1/25 sec., a leaf shutter could open up to all the light from a
>flashbulb and required no delay.  The "M" setting was for flashbulbs at
>shutter speeds higher than 1/25th sec.  It started the filament burning
>a few milliseconds before the shutter opened so the flash could be
>caught at its peak. "F" was for gas filled bulbs that burned a lot
>faster, about 1/200 ms., requiring less shutter delay.
>
>Allen Zak

The problem I had, in the 1950-53 time frame is that I had an Argus C4 and 
subsequently picked up a strobe during a navy cruise in the Caribbean.  I 
bought a strobe in Panama and found that with the flash setting on F, (M 
being the other option) the f-stop setting had absolutely no effect on the 
exposure, everything was under-exposed.  I kept using larger and larger 
f-stops but got no improvement.

I finally had the bright idea of shining the strobe into the back of the 
camera and found that the behind-the-lens shutter was not open very far 
when the strobe went off.  I finally ground a new flash cam in the shutter 
driver cylinder and got an X-setting that worked.  I eventually had to send 
the camera back to Argus for an un-related repair and they disabled my fix 
and I had to do it all over again.  Turns out the C-4 and similar models 
had a bad habit of breaking a little toggle lever which linked the rotating 
cam to the shutter driver ring.

DAW






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