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Hi Eris
I have a C9.25 and both the x2.5 and x5 Powermates. I would not recommend the x5 for a ‘scope of this focal length. Although I have used it for double star work with my ST7, it only gets an outing approx 3 to 5 times per annum, for very short spells.
I think that Matt in Brissie may have a x4 Powermate (2”) and RobT used to use one on his C9.25 for planetary imaging, but it seems the seeing is rarely good enough to use this combo.
I have a x3 Barlow for the C9.5 and I think a x3.5 might be as far as I would like to go for consistent usage without compromising the image?
Cheers
Dennis
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