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Well, I don't reckon it'll be much chop for long exposure stuff...all-thread straight off the shelf is not high precision stuff. = big periodical error. This stepper takes pretty coarse steps so even though I can't see the steps by eye even as high as 212X mag...I reckon it'll be seen in the camera. Need to make some all-thread in the lathe & micro-step the motor for that. Short time exposures should be ok though. Just have to test it better to see what it's capabilities are I guess..
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