Effect of a coma corrector on focal length (Paracorr 2)
- SkyHiker
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Effect of a coma corrector on focal length (Paracorr 2)
Does anyone know if this is could be the cause or is it more likely an issue with index files, and do I just have to wait longer because of the longer focal length (1200 mm for the 12" vs. 162 mm for the guide scope)?
I could point the scope at a remote hillside and test for focus with and without the CC, add the 55 mm for the rings to the difference. It should not be a whole lot more, maybe 100 to 150 mm. If it behaves like an ideal lens, that is. Perhaps enough to mess things up.
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Re: Effect of a coma corrector on focal length (Paracorr 2)
Your focal length with the Paracorr II should be 1200 X 1.15 = 1380mm, Are you using the "turntable" with the Paracorr or a spacer?
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Re: Effect of a coma corrector on focal length (Paracorr 2)
BABO
Scopes: Stellarvue SV80 Raptor Carbon Fiber ED Doublet / Celestron SCT C8
Williams Optics 66mm APO / DIY 8" f/4 Newtonian astrograph / Nikon 180mm f/2.8
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- notFritzArgelander
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Re: Effect of a coma corrector on focal length (Paracorr 2)
Yes, just so.Piet Le Roux wrote: ↑Wed Apr 14, 2021 5:38 pm Good day Henk,
Your focal length with the Paracorr II should be 1200 X 1.15 = 1380mm, Are you using the "turntable" with the Paracorr or a spacer?
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Re: Effect of a coma corrector on focal length (Paracorr 2)
Thanks Piet I will try that.Piet Le Roux wrote: ↑Wed Apr 14, 2021 5:38 pm Good day Henk,
Your focal length with the Paracorr II should be 1200 X 1.15 = 1380mm, Are you using the "turntable" with the Paracorr or a spacer?
I use a spacer, 2 rings of 55 mm total. The fancy turntable is just for visual.
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Re: Effect of a coma corrector on focal length (Paracorr 2)
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