Quote:
Originally Posted by raymo
Bahtinovs are great, as Colin said. It's a bit sad though that your scope is not stable enough for you to be able to focus manually. For about $90 the
electric focuser is the way to go; if you get one you'll wonder why you didn't get one from the outset. For visual focus, when I've got it right I remove the cable and controller, so no trailing cables.
raymo
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Maybe my eyes don't deal as well with motion blur as others, but I find even gently touching the fine knob on the Crayford, or even the cooling fan running creates enough HF vibration that details are lost (I need to investigate a PWM speed controller to see if I get less blurring with lower speeds). The fan vibration is not a lot, but it's enough that the very finest details are obscured, and you wouldn't know because it's high frequency. Mars still looks like Mars, only with less fine detail that would probably be put down to atmospheric conditions unless a comparison was made, but I digress...