Re: Was told this is Drift...
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It's not a shadow, it's from your autostacking software. You must be using a piggyback autoguiding system.? The piggyback scope and autoguider are centered on a spot not exactly the same as your main imaging camera.? And you are not exactly drift aligned for polar alignment.?? So what happens is this: the autoguider system is keeping it's target in the cross hairs, but the earth will appear to be rotating around a different spot. You can also have "differential flexure" ,? a fancy name for all the mechanical shift in the mounting of the piggyback scope system. There are some good solutions to try: 1. Center the autoguider system on the center of your main camera image, if possible. 2. Drift align the mount.? This takes time but the PHD2 program has a nice Drift Align tool...you just use that to make the DEC axis line horizontal. 3. Get an OAG and then the guiding will be on the main scope image... As you said, you can always crop the final image! Stay well and have fun, Michael On Wed, Jul 1, 2020, 9:05 AM Sonny Edmonds <sonnyedmonds@...> wrote: Is there a way to correct it? |
Michael Herman