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Hi Eris
What's the focal length of your C11? Something like 2.5 or 3 metres? A 5x powermate will be really difficult to start with, and you'll need really, really good seeing to use it at those focal lengths (over 15m!!).
Definitely start with a 2.5x powermate though, which will give you 7.5m or a little more - a good magnification to start out with.
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