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  #21  
Old 10-11-2019, 04:33 PM
thercman (Greg)
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Awesome guys thanks!

Well it looks like the C11 is on my purchase list.

Do you guys recommend putting say a Moonlite focuser on it and locking the mirror in place?

Now I just need to figure how to explain to the wife what the big tube in the living room is. lol
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  #22  
Old 11-11-2019, 10:02 AM
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Camelopardalis (Dunk)
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Personally, I've found the large focuser knob on the C11 perfectly adequate for visual and planetary work.

For DSO...note the mirror locks only exist on the Edge HD series, not the conventional SCT/XLT series.

There is a technique with Celestron SCTs whereby your final focuser knob movement should be anti-clockwise. This apparently takes advantage of gravity and leave the mirror in a settled position. Note that for large changes in pointing direction, it may be worth checking your focus again until you observe how much shift you may or may not have. It varies from scope to scope (often due to distribution of the grease on the baffle tube) and has no bearing on the optical quality of the scope.

FWIW, a C11 is not a particularly large tube...when compared with, say, a 12" Dobsonian
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  #23  
Old 11-11-2019, 11:58 AM
Tulloch (Andrew)
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For focussing, I'm still using the standard focuser, but I put some thick pipe insulation rubber foam over it to reduce vibrations
https://www.clarkrubber.com.au/produ...ipe-insulation

However, I have my eye on this ...
https://www.celestron.com/products/f...sct-and-edgehd
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  #24  
Old 11-11-2019, 12:40 PM
thercman (Greg)
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Quote:
Originally Posted by Camelopardalis View Post
FWIW, a C11 is not a particularly large tube...when compared with, say, a 12" Dobsonian
Very true... Compared to my 4" refractor it's big though. :-)

My 12.5" truss tube dob sits in the garage. Some day I'll buy a mirror for it...
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  #25  
Old 11-11-2019, 12:41 PM
thercman (Greg)
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Quote:
Originally Posted by Tulloch View Post
I put the ASI EAF on my refractor and love it...
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  #26  
Old 11-11-2019, 07:10 PM
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The_bluester (Paul)
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I have one of the Celestron focusers on my C9.25 for photographic work and it is a godsend. I am not sure if they would be as useful for visual work but anything that keeps you from having to touch the tube is a good thing. The only thing it is missing is a temperature sensor.

For manual focus or automated, you always want the final focus move to have the mirror going up the tube against gravity, as Dunk mentioned.
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  #27  
Old 15-11-2019, 07:06 AM
Tulloch (Andrew)
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Thanks for the tip, Paul.

To the OP (Greg), when you get your new scope, post a picture of it here!

Andrew
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  #28  
Old 15-11-2019, 02:14 PM
thercman (Greg)
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Hey Andrew!

I will do! In the mean time here is my current rig. :-)
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  #29  
Old 15-11-2019, 02:27 PM
Tulloch (Andrew)
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Geez, I thought I had a lot of cables! Is there a scope in there somewhere amongst the spaghetti?
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  #30  
Old 15-11-2019, 03:11 PM
thercman (Greg)
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Quote:
Originally Posted by Tulloch View Post
Geez, I thought I had a lot of cables! Is there a scope in there somewhere amongst the spaghetti?

I think so.
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