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Hey Thomas I have never had this problem because I have a permanent observatory but you might have luck with putting a low wattage light bulb, filament type, under the cover to keep a gentle heat

This morning there was heavy frost here in New Mexico, 22 degrees F, and while observing Jupiter at dawn I had to use a hair drier frequently ( on low setting, gently ). When I ended my session and

Yea maybe I went off on that when I should not have. “Fools rush in where wise men dare not tread”! I guess what I was trying to say in too many words was that even the best machines in a lot of

it appears that you took offence when none was intended. Stan

Stan I was not going to get into this any further but want to say one last thing. I do not know if you have run any machine tools or for that matter built anything of a complex nature but this is

Stan You are right on everything you said. I am not interested in getting into a uranating contest. Have a nice day. Thanks Gary US Precision 18328 E Sunnybrook Lane Gilbert. Az. 85298 USA

re "white paper" I found it. Indeed they do apply corrections to the secondary if the overall system is defective. Though I suspect it is not a common occurrence. So it could be very important to

" read the white paper " ?? link please "mirrors and if they are not perfect they just keep chucking them into a pile " They would be sent back to the fine grinding stage. Much cheaper than hand

Full size image. Veil nebula (georgeh630) - Full resolution | AstroBin http://www.astrobin.com/full/224434/0/ Veil nebula (georgeh630) - Full resolution | AstroBin

My first narrow band image that works out OK. Veil nebula (GEORGE) | AstroBin http://www.astrobin.com/224434/0/ http://www.astrobin.com/224434/0/ Veil nebula (GEORGE) | AstroBin

Well if you read the white paper this is what it says: If the combined optics set shows any slight residual under-or over-correction, zones, astigmatism, upturned or downturned edges, holes, or

" the secondary mirror was hand-polished into a non-symmetric shape to correct..." Does anyone truly know this for a fact? I doubt it. That is an expensive operation requiring significant time of

The lore on the old non-edge C14 was that the secondary mirror was hand-polished into a non-symmetric shape to correct small errors in the primary mirror and corrector plate, so that there was a

Thanks for the guidance, Don. I'll give the scope a check. Lee C14_EdgeHD@...> wrote: --

Lee, I believe this would apply to all Celestron HD scopes, and doesn't matter if you use a Hyperstar or not. The secondary shouldn't be loose or turn. It will mess up your collimation and as Allister

Thanks, Allister.

You are quite welcome. I hope all works out well for you. Gary Carle Noctem C14_EdgeHD@...> wrote:

Gary, Dean is quite knowledgeable and helpful. I have dealt with him before. We had a bad thread on the Hyperstar camera adapter and he sent me a new one, no charge, and didn't even want the old one

Don, these instructions are for all HD's correct? Not only in relation to Hyperstar usage? Also, can it be assumed the secondary notch will be properly oriented with the baffle tube fully tightened

YES, it is. The primary has usually got a very good figure because it is Spherical and easier to make, but the Schmidt Corrector often has various flaws. Celestron hand null the Secondary mirror with