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  #21  
Old 17-11-2017, 09:37 PM
brian nordstrom (As avatar)
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Ken + 1 on the C9.25's , I sold my awesome Mewlon 210 and kept and still love my C9.25 ( very close between these 2 in what you see ) , something about these scopes that performs .

No offence to my good friend that has a C8 XLT carbon fibre ( you know who you are ) just like mine and together as good as the C8 is there is something special in that 1.25 inches ,
true . C9.25 is a planet killer .


Brian.
Quote:
Originally Posted by Merlin66 View Post
Coming in late....
I’ve used all the Meade Lx200,8”,10”,12” and then moved to Celestron....
I had the C925 for a few years, then stupidly sold it!! Big mistake. It was one of the best SCT I ever used.
Replaced it and was VERY happy, until my wife bought me a C11...
I couldn’t sell HER telescope so the C925 went......
The C11 meets all my needs for spectroscopy........but I still miss the C925.
No matter what is said, it definitely punches above it’s weight.
If I needed another SCT it would definitely be a C925.
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Last edited by brian nordstrom; 17-11-2017 at 10:14 PM.
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  #22  
Old 04-12-2017, 02:21 PM
Steve14 (Steven)
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Ok im getting a c9.25 xlt for sure. Next question. Do i get a powermate? From what i figure, if i want to image at say .33arcseconds, then i will need a focal length of 3.9meters. That is assuming i use my existing dslr which has a pixel size of 6.25 microns. As the c9.25 has a fl of 2.35m, then a 2x powermate would hopefully do the trick. Or do i get a different imaging camera and no powermate/barlow? Decisions decisions ...
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  #23  
Old 04-12-2017, 02:41 PM
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Merlin66 (Ken)
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My rule of thumb is the optimum hi-res focal ratio is 4 to 5 Times the micron pixel size, for a 5 micron pixel camera this would indicate f20 to f25.
A x2 PM would fit the bill.
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  #24  
Old 04-12-2017, 03:02 PM
Steve14 (Steven)
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Ok im getting a c9.25 xlt for sure. Next question. Do i get a powermate? From what i figure, if i want to image at say .33arcseconds, then i will need a focal length of 3.9meters. That is assuming i use my existing dslr which has a pixel size of 6.25 microns. As the c9.25 has a fl of 2.35m, then a 2x powermate would hopefully do the trick. Or do i get a different imaging camera and no powermate/barlow? Decisions decisions ...
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  #25  
Old 04-12-2017, 04:20 PM
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Merlin66 (Ken)
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As you probably already know, the DSLR isn’t an optimum camera choice for this type of imaging. I’d look at the ZWO or QHY offerings.
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