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Member Junky
Posts: 25
Location: Haslet, TX | Hey,
I have a question about a new 2" GSO diagonal on my Celestron 8-SCT. The diagonal spins around easily and when I put a heavy eye piece on it gravity pulls it down. Can I tighten it? I have tried but I don't see how to.
Edited by TexasStars 4/28/2011 11:55 AM
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Admin
Posts: 5323
 
Location: Marysville,Wa 48.07N-122.21W | Hello, am I right in assuming that this is an SCT? Usually these take a diagonal that threads onto the back of the scope. The only tightening is by snugging down the collar.
If you have a standard star diagonal that slips into the visual back, then there should be one or two thumbscrews that will need to be tightened down.
I had a cheap diagonal that would unscrew at the barrel when using heavy EP's. A little glue fixed the problem. 
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Forum Support Old Timer
Posts: 6245
Location: Mandeville, LA USA 30.38 X 90.07 | I had that problem some time ago. The threaded portion was too long and wouldn't allow the diagonal to snug up against the scope. I was lucky in that I had an extra threaded section from a different diagonal. I removed the original, put the spare that I had onto the new diagonal and it worked just fine. You might want to contact the dealer that you bought it from and find out if there's a fix or if you can get your money back and try a different diagonal.
David |
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Member Junky
Posts: 25
Location: San Jose, CA | I had the same problem as the OP...my Orion Dialectric diagonal kept rotating, even though the "input tube" was as tight as could be.
Now, folks may be just appalled at my solution (many wouldn't dream of 'defacing' their gear this way!) but I solved that problem by taking a small drill bit, and a variable speed drill, and drilling a very shallow "dimple" just opposite the setscrew of the scope's focuser drawtube collar. This dimple is just deep enough to allow the setscrew to "sit" in the depression, gaining friction and stopping the tendency to rotate.
I don't want to hot-link the picture in my article, here, as it will suck up my server usage every time somebody trawls thru this thread; I'd rather just link to the entire very long article on my eyepieces and accessories. There is a closeup picture of exactly how I made the 'dimple'. Look about 5/8ths of the way down the page in the section titled "Orion "Dialectric" 2.0" Diagonal" for the information and picture.
http://freescruz.com/~4cygni/faintfuzzies.blogspot.com/equipment-ro...
I also have some other "crank" solutions for problems with Orion RACI finders and such--purists who love equipment will be appalled at my willingness to take crude blunt instruments to them to batter them into the shape I desire!
Steve W. |
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Diagonal Tightness
