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Bad focus or bad seeing

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Despite getting a focus motor I've been struggling recently to get decent focus.  I'm getting some good help with that from people on the SGP forum.  But with all the recent bad weather we've been having in the UK recently I began to wonder if the problem is bad focusing or bad seeing.

Is there any independant way of evaluating the seeing conditions without relying on HFR values from SGP?


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By pure chance I found the answer on the Tips and Tricks Forum: Meteoblue.com.  I'd never heard of it before but it gives arcsec seeing values that cover where I live.

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