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deSitter
Carpal Tunnel
Reged: 12/09/04
Posts: 2925
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Here's a handy (for me at least) Paracorr trick - defocus so that the shadow of the secondary is clearly visible but not too large - and tune the Paracorr so that the pattern is symmetrical in the out-of-focus center stars as well as the out-of-focus edge stars. Coma will make a lopsided pattern with the shadow close to the inner edge.
-drl
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JoshH
member
Reged: 11/07/08
Posts: 47
Loc: Jefferson City, MO
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Anyone have any suggestions for the proper setting on the University Optics 40mm MK-70? I tried this eyepiece for the fist time in my 16" F4.5 dob along with the Paracorr and I was quite happy with the performance. There was still some coma present, but it made a totally un-usable eyepiece in my dob into an eyepiece I will probably use often. The sky background was a bit too gray for my liking in what I would call pretty good skies, but it made a nice view for large objects like the double cluster as it gave a 1.3 deg FOV. The exit pupil is a bit large but I never saw the shadow from the secondary. I found that position 2 seemed to give the best view, any other comments?
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16" F4.5 Astrosystems Telekit, Galaxy Optics Primary
Meade LX-50 8" F10 SCT Magellen II DSC (For Sale)
Intes Micro MN-56 Maksutov Newtonian
Orion 100mm F6 Achromat
Orion ST-80 F5 Acrhomat
Unistar Alt-Az Mount
Celestron CI-700 Mount
UO 40mm MK-70, 26mm Nagler, 20mm Pentax XW, 13mm Ethos, 8mm Ethos, 4.7mm 5k UWA, TMB Planetary Set, Paracorr.
Modified Canon 400D
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