Quote:
Originally Posted by cfranks
Hi H,
I have had a DSI RC10C for about 5 years and have really only had one successful image (my fault, not the 'scope). A 4 frame mosaic of Omega Cen. http://www.astrobin.com/full/80259/0/ I haven't used it for 3 years or so since I set it up imaging on a forecasted clear night and went inside for a cuppa. Came out again and it was raining and the primary was like a half-full soup bowl! When I eventually removed the primary mirror, cleaned and very accurately replaced it, I had managed to put it out of collimation. Having no experience there I struggled along until Paul published his work in that area and now I might have finally fixed it. Haven't had a suitable night for > 3 months to test it but here's hoping. One of my favourites, NGC 300, is now rising and it fills my QSI638 perfectly with the RC10C.
Probably my only change, if I had my 'druthers, is to get a CF tube rather than what it currently has. The RC10C seems to require an awful lot of focusing and I would think a CF tube would reduce that.
Cheers |
If you like Charles I can come out one afternoon soon and check the collimation with my tak scope Charles. What type of focusor do you have? Is it a 2" or a 3" and does it have a 2" adapter?
Quote:
Originally Posted by gregbradley
Yeah carbon fibre fixes that constant refocus need. I find my CDK17 and the RCOS 12 I had hold focus extremely well once the mirror is close to ambient.''
This is an interesting thread as it highlights the decision making process a lot would be going through for this type of scope. It inevitably winds up with GSO because of the value and the high quality optics. That's probably exactly why DSI switched markets.
Greg.
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I refocus via automation every 90 minutes or so but the change is barely worth mentioning and more to do with seeing conditions and altitude I think. I found the RC12 quite stable too since I put the mirrors in a truss. In the steel tube is moved around like a wobbly custard.