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Originally Posted by janoskiss
Geoff, can you elaborate on what you mean by saying that you cannot fault the star test? Do you get the same ring pattern either side of focus? I don't with either the 8" or the 12".
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Yes Steve, I get the same ring pattern allowing for the fact that the inside focus rings are always a bit fuzzier due to atmospherics.
What Im looking for is the distribution of brightness of the rings, especially the innermost and outermost ones, and it appears to be identical on both sides of focus as best as I can tell.
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Ah well my scopes seems to work well for observing thing other than defocused diffraction rings
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Lol yes, we dont purchase scopes just to look at diffraction rings do we?
The Saxon dob I mentioned earlier showed obvious spherical abberation under star testing, but it did give me the best view of Jupiter I have seen to date, as its the seeing holding our scopes back 99% of the time.