PJ,
Just a follow up to my earlier post about shutter speed testing. I
have completed a test of my "new to me" Canonet QL17 and have a *.wav
file of the shutter test from 1/4 sec. to 1/500. If you would like a
copy to see the available resolution I would be happy to send a one off
line to all who ask. The file is ~650Kb and is quite easy to see the
typical errors of an older RF Copal shutter when using a program like
Cool Edit. The low and middle speeds are all with in 1/3 stop but the
high end is slow. In this case the 1/250 and 1/500 are ~2/3 stop slow.
As this is a Copal Shutter the Left and Right channels are identical,
but for a Focal plane shutter the lag between the channels yields the
individual curtain speed. This test took about a 45 minutes to complete
including the time used to determine the error in the speeds.
Mike Butler
Dublin, California
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