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Focus on 10 inch dob
I have a 10 inch dob from bintel with 15mm and 9mm Fully Multi-coated Plossl Eyepieces (1.25") and 26mm Wide View Eyepiece (2"). The 2" has got good focus but the 15mm and 9mm are hard to focus. If I am looking at Saturn it seems to be in ok focus if it’s in the edge of view but if its in the centre it looks fuzzy. Is it just the atmosphere or do I need to adjust something on the scope to make the image sharper?
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