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Yes, I'm using the 13.1" these days, I can't switch back to the 10" without some surgery as I had to swap the focusser across.
I'm usinga 5x powermate with a filter wheel and short extension tube on the output side which gives me something like 6x or an effective fl of about 11m @ F34. I could probably get to F40 under excellent seeing conditions but we haven't had any of those yet ...
regards, Bird
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