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Thanks for your help guys. Possible reasons include (before getting to eyepieces)
1. light pollution here on the highway in Surfers. it really is terrible.
2. atmospheric heatwave, although the image I had last night seemed clearer than last week.
3. collimation. I noticed last week when observing Venus, i had it out of focus at one point and Venus looked like a ufo i.e. oval. I can't imagine that being optimal. Found a good guide last night on collimating orion maks, which have the same setup, so will work through that first.
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