This is an image (60×10s, L filter) taken few days ago, somewhere in Cygnus, once I finished fiddling with the primary mirror cell of my GSO rebranded 6” f/4 Newt. As the title may suggest, I removed the clips keeping the mirror attached to the cell and hence no more clip-induced fans spreading from brighter stars (not that it ever stopped me imagine, mind you). No mask or other gismos, just the pure, un-adulterated mirror surface, warts and all. I also changed springs and washers, inserted shims to avoid mirror shift and cleaned the whole shebang which quite clearly needed a once-over after 4 years in the field. Because me messing around with it and also changing the focuser, tilt correction is gone a bit out of the window (ASTAP reports mild tilt, around 13%) so the furthest corners do NOT enjoy a distortion-free life. That will be for another night though…
📷 Test_PH150_ASI294MM_L_60x10s.jpg
And if you’re asking yourself what’s the trick the answer is: 3 dabs of RVS @ 70% of mirror radius (neutral diameter), equidistant from the cork pads.
