One warning -- change to 500 before you cock the shutter on Compurs. That warning has been published in a number of spots. I assume it has to do with the extra tension which you can easily feel when you change to that speed. Other than that, I don't know of any warnings or instructions on before or after. I could be wrong. I generally change before cocking because I think it is easier on the mechanism. But I could be wrong on this too. Dave
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