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hi vasili.......... wow where to start!
you need to have a good to very good polar alignement,you will need an intervalvometer so that you do not have to physically "press" the camera button and set it to "bulb"
if you have not got a wedge on the cpc you may only get up to a one minute exposure before you get what is called field rotation
the best photographer with a similar setup to you is our member wayne anderson perhaps private message him
pat
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