Generally, I've always heard that a given amount of overcorrection in a refractor lens is considered to be worse than having ~the same amount of undercorrection. Is this true? Why? Can overcorrection be "corrected" in some practical way?
overcorrection worse than undercorrection?
Started by Toseeka, 03/13/2008 12:45PM
Posted 03/13/2008 12:45PM
Opening Post
Posted 03/13/2008 02:14PM
#1
My eperience is that it depends on the degree. A mild over correction (1/5th wave or better) is hard to detect but may actually be usefull for a portable instrument as the lens will typically appear undercorrected during cool down, resulting in a more useful image quicker. Also, the eyepiece used can offer a degree of over/undr correction so you need to be careful in your assesment of the lens by star test by using different eyepieces.
As usual, nothing is easy.
Why do you ask?
Jeff
As usual, nothing is easy.
Why do you ask?
Jeff
"Don't sweat the petty things and don't pet the sweaty things" 8O
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