I have a 7, great camera, and fun to use. Go shoot film!
...and I have to ask - what is that background, and where can I get one!??!
Youxin won't work on the Canon 7. I asked. I have a 7 and a 7s. Ross Yerkes cla'd mine. Good work, not expensive, usually a 2 week turnaround. (323) 256-1018.
I'll bet if you check the shutter speeds they are slow. In my opinion you can't buy a 50 year old camera and reasonably expect everything to work properly. When I buy an old camera or lens (and all of my cameras and lenses are old!) I factor in the cost of a CLA.
Based on the results of the Mercury II test, I suspect some of the error is in the measuring equipment or technique. The good engineering and simplicity of the original Mercury shutter resulted in better accuracy than its contemporaries. The Harvard College Observatory chose an early Mercury shutter over Leica and Contax because of its consistency, accuracy, and durability in Solar movies. This shutter had recorded 112,000 exposures in temperatures down to zero at the time of the observatory's report. Another independent test of the time showed a 5% error for the top speed of a Mercury and nearly 50% errors for Argus, Contax, and Leica top speeds. The source for this is The Univex Story by Cynthia A. Repinski, available online for a wide variety of prices.
Focal plane shutters like those in Canon and Leica use a clockwork retard system for the shutter speeds that will sync with electronic flash, and a different system for the higher speeds. Thus, the accuracy of each system is largely independent of the other.
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