Just for interest, how did you determine a 0.02mm extra spacer would improve the
I am a bit confused too, as I thought refractors were not susceptible to
All the best, and happy viewing.
Dean
The amount of spacing was trial and error indeed.DeanD wrote: ↑Fri Nov 06, 2020 12:54 am Sounds great John, and I concur with your comments about how good these scopes are, especially with low-medium wide-fields.
Just for interest, how did you determine a 0.02mm extra spacer would improve the coma? Was this trail and error, or was one of the existing spacers thinner than the others?
I am a bit confused too, as I thought refractors were not susceptible to coma. Maybe the spacers, being a bit pinched, were causing some slight mis-alignment, hence the apparent defects at 270 degrees in your image? Is that what you mean by "axial coma"?
All the best, and happy viewing.
Dean
Great! I suppose that is quite necessary.MistrBadgr wrote: ↑Wed Nov 25, 2020 4:19 am I work almost exclusively with beginner scopes. I fix up 60mm refractors and give them to promising children. Blackening the edge of the lenses is the first thing I do. For entry level scopes with a simple AR coating, changing the circumference from white to black changes the whole character of the scope. I do a number of other things to the scopes, but that is always the first.
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