[rollei_list] Re: Flashbulbs
- From: Don Williams <dwilli10@xxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 31 May 2005 19:55:07 -0700
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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