{"id":321,"date":"2020-12-05T21:29:26","date_gmt":"2020-12-06T02:29:26","guid":{"rendered":"http:\/\/mvas.org\/mvas_wp\/?p=321"},"modified":"2020-12-05T21:29:26","modified_gmt":"2020-12-06T02:29:26","slug":"fixing-mirror-flop","status":"publish","type":"post","link":"https:\/\/mvas.org\/?p=321","title":{"rendered":"Fixing Mirror Flop"},"content":{"rendered":"\n

I just finished putting my new to me C9.25 back together. It had the classic symptom of not holding collimation and not holding focus after slewing. I suspect that this scope has never been taken apart as there were spots of fungus on the inside of the corrector and the corrector was really stuck! I marked its orientation, sprayed around the edge with Windex, and carefully worked it loose. I reached down inside and engaged a wooden dowel with one of the spanner holes in the lock ring a nudged it. Sure enough, it was completely loose. I could turn it about 1\/2 rotation without any resistance. Just a tad more, and it was snug. While I had it open I removed a few tiny spots off of the primary and secondary with lens tissues .(I _hate_ touching the mirrors, but sometimes you get lucky) The secondary also have a bit of fungus, now clean.  I carefully cleaned the inside of the corrector with Windex followed by breath and lens tissues. Before closing the tube I inverted it and used a puffer bulb to blow the dust out, and then carefully lowered the corrector back in place. I didn’t like the original tiny spacers, so I cut ribbons of black construction paper and layered them evenly around the corrector until the gap was full (about 5 layers total all the way around). I remounted the rail, reinstalled the finder, touched up the paint, and now it’s ready for testing. I love reconditioning these old scopes!<\/p>\n\n\n\n

So far I’m 3 for 3 finding loose lock rings. Tomorrow I’m going to open up a 12″ that’s showing the same symptom. Gotta do something while it\u2019s cloudy.<\/p>\n","protected":false},"excerpt":{"rendered":"

I just finished putting my new to me C9.25 back together. It had the classic symptom of not holding collimation and not holding focus after slewing. I suspect that this scope has never been taken apart as there were spots of fungus on the inside of the corrector and the corrector was really stuck! I […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","pgc_sgb_lightbox_settings":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-321","post","type-post","status-publish","format-standard","hentry","category-forumus-equipment","entry"],"yoast_head":"\nFixing Mirror Flop - Miami Valley Astronomical Society<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mvas.org\/?p=321\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fixing Mirror Flop - Miami Valley Astronomical Society\" \/>\n<meta property=\"og:description\" content=\"I just finished putting my new to me C9.25 back together. 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