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Large FOV shifts at non regular intervals


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I gathered just over 5hrs data last night putting the mini rig through its paces to make sure it's ready for international travel. The scope is the Sharpstar 61EDPH II and I'm using it with the 0.8x reducer. Just looking through last night's subframes it appears I'm getting a shift in FOV at random moments, the period between each seems to suggest after autofocusing. I checked over the rig just now and it seems loose at the reducer rotator? I've done a little searching but I haven't managed to find any discussion about this reducer, how to adjust for tilt, tightness of the rotator etc. I wondered if any brains on here might have had to deal with a similar issue?

On a side note, how do I view my guiding logs as a typical PHD2 looking graph?

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