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The Dumbell

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9 years 7 months ago #104030 by Seanie_Morris
Replied by Seanie_Morris on topic The Dumbell

Bruno wrote: it is not cropped... Even though I use a Baader coma corrector the stars are not round particularly on one side

That's why I asked! The field wasn't totally flat, but I only notice the 'trailing' towards the corners on the bottom. I was wondering was it the fast curvature of the mirror or not. :)
Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.
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9 years 7 months ago #104031 by Bruno
Replied by Bruno on topic The Dumbell
Yeah, probably due to sensor tilt. CFZ is focal ratio X pixel size. For me that is F4 X 7.4 = 0.03mm. So it does not take much of a tilt to show. Make me think I should be looking for a new focuser.
John

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