Tuesday, July 9, 2019

190701 C8 Ronchigrams by Mike Chibnik

C8 Ronchigrams

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Mike Chibnik

AttachmentsMon, Jul 1, 8:51 PM (8 days ago)


to ceztom, tomt, me, tscrawf3, TCrawf3, kometes, rberry, 54healeyguy, bahu, jerryawilsonphd, Christopherulivo, emilanes
My old C8 had enough dirt and smoke residue on the corrector plate to grow radishes, so it was time to give it a good cleaning.  So I removed it from the tube assembly and used a lot of water Dawn soap and after a bit of soaking followed by gentle use of cotton swabs the gunk was removed.  I followed that with a liberal rinse of distilled water and a spritzing of 90% alcohol and gentle use of canned air and dabbing with tissue paper.  In it went making sure i oriented to the position marks I made before removal.  I used the scope for Mercury viewing the last week and noticed optical alignment was slightly off.  I did the best alignment I could do last night with it unfocused using concentric circles with the secondary mirror.  After alignment I I wanted to do a star test but the air was too unsteady.  So I used the  Ronchi screen eyepiece I had loaned to the other Mike to see what type of figure my scope might have.  It appears my old scope has reasonable optics.  Images were taken with my old iPhone.
 


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