Is there some issue with old "auto-thyristor" flashes and digital cameras
that would lead to inconsistent exposure? Somebody told me that when you
combine auto-thyristor electronic flash with a digital sensor, the digital
sensor may not "see" what the thyristor does. Anyone know more about this?
I was fooling around with my E-1 and a generic automatic (non-TTL) flash--a
Vivitar 2500. I hadn't used the flash for a while, so I used the E-1 to
test it prior to shooting candids at a wedding with B&W film and an OT
rangefinder camera. I found that the flash overexposed close up and
underexposed *drastically* at medium to far distances (supposedly within
its auto ranges). Almost as if the sensor wasn't working. I got the same
general results with direct flash, bounce flash, and a Lumiquest "Pocket
Bouncer." The little "exposure OK" light on the flash lit, but the camera
did not see things that way.
I tried this with an even older flash and got similar results. (Yes, the
flashes' trigger voltages were within the E-1's tolerances, and I shot at
1/60--a little below the E-1's maximum speed for flash synch).
The Vivitar 2500 worked fine when used with film--a little variation from
near to far, but well within film latitude.
What gives?
--Peter
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