Re: APPM requirements
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Jeffc
Speaking of “requirements”… What’s the thought on using APPM with a non-permanent setup? Fwiw, I’m using the mach2 now with an st8300m + fs128 at about 1040mm focal length and am “visually” seeing decent round stars with 5 minute unguided exposures. I’ve only had the mount for a couple weeks, but I also used the 130GT at 614mm with (iirc) 20 minute exposures unguided. Yes, objects do not land in the center of the chip on a goto , but it is usually close enough such that I can plate solve , sync , then goto again (for proper framing). I’m guessing APPM might help with longer exposures , and also with objects low on horizon affected by atmospheric distortion… the latter would be nice to correct for. At this point I image objects when they are fairly high on the sky. What would be the guidelines for a “portable” setup ? Eg a) create model at the site but it could be reused for the same location? b) or.. it is necessary to re-create model if the mount is moved.. ie polar alignment is re-done? I’ve just wondered about the practicality for a non-permanent setup, and the conditions where APPM is needed for unguided imaging… eg the focal length where APPM becomes effective over just the encoders on a polar aligned mount.. Or is the benefit simply repeatable pointing accuracy? Thx
On Mar 23, 2021, at 12:39 PM, Dean Jacobsen <deanjacobsen@...> wrote:
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