Originally Posted by
Peter Yeti
It's all said already. Stick with the old Compurs, they beat the crap out of Copals. I have a dial set Compur from 1923 that's way more accurate than my latest Copal. The old dial set ones are very easy to service, the rim set ones are much more difficult but no problem for a good service technician.
If you have to use the shutter of the 180mm with your 240mm tomorrow, just multiply the f-number on the shutter with 4/3 to get the correct f-number. No guess work necessary. If you have an accurate vernier calliper at hand you can measure the cell spacing and overall length of the Tele-Xenar in the original shutter and compare it to the values in the new shutter. If both are the same you should be on the safe side.
Good luck,
Peter
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