Quote:
Originally Posted by Astroman
Do you find the Nema17PG27 slow enough for focusing very small amounts? What is the reduction on that, I think I saw several different ratios.
Do you know of an Aussie supplier for the motor? I may give it a try...
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PG27 means planetary gear 27:1 I believe. The actual ratio is ever so slightly less, but close enough.
For the steps you need to work out what is required for your system. It involves measuring how far your focuser moves for a complete revolution and the focal length of your scope. Then you can work out how many steps a particular stepper/setup will spend in the "critical focus zone". This is covered in the myFocuser documentation.
Hence what you need depends on your focuser and scope.
Quote:
Originally Posted by rmuhlack
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This is where I got mine from too.