Question about Optics
When looking at the brighter stars I cannot focus them to a sharp image. They appear fuzzy. Image of a star test on Vega attached (taken with a Watec 120N webcam). Diffraction rings are sparse and mottled. Does not really indicate that scope needs collimation. Can you help please.?
The image shows that the optics are not centered properly. The secondary may be tilted slightly to the 2 o'clock position. When not centered, a focused star will have an astigmatic shape, and not come to a full focus. Also check the mirror and corrector plate for dewing, that will also affect the views.
Posted on Nov 08, 2008
I have had the same problem, but when I got used to the collimation process and which way to turn the adjuster screws life has been much easier for photographing, usung a 7.5mm eye piece for adjusting the perfice circle.
Posted on Aug 20, 2010
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Posted on Jan 02, 2017
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