Hi folks,
I am a new user of N-series astrograph, more precisely, I am a newbie user of Newtonian system at all (so far I've been imaging with refractors and cassegrains only) though I find myself already to be an experienced astro imager.
Do you know what is the exact root of this issue? I can see double reflection on diffraction pattern around bright stars. In my pre-zero light first night of testing new AG in the field, I made few tests to see how the ASA really works. I have touched collimation only slightly, only of the primary mirror. So far I did not touch secondary nor tested axial error of the focuser (I simply trust ASA ). I do own, already, all CatsEye tools from Jim Fly and all tools from Howie Glatter so I know it's not perfectly collimated (infinity always shows a residual error, howie shows "almost OK").
I very much hope it's caused by improper collimation and not by some other mechanical problem of my astrograph (I have both hands "left hands" so I can't fix anything myself without a visit to specialized laboratory - someone with mechanical skills).
here is the full sized image, ignore the vignetting of the window, that will be fixed today on my camera:
http://www.astro.cz/galerie/v/uzivatele/Konihlav/misc/CCD+Image+55LUMLUM.jpg.html?g2_imageViewsIndex=1
please, let me know what you think, I really need exact and precise answer and proposed solution. No time left to "try and see". I'd like to make a real first light this year.
Pavel
