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Formula for astigmatism?

Started by Larry Seguin, 10/23/2004 08:49AM
Posted 10/23/2004 08:49AM Opening Post
'Morning everyone!
Does anyone happen to recall the formula for figuring out at what focal length eyepiece observers with astigmatism no longer need to wear eyeglasses? Thanks in advance for any help on this one.
Larry Seguin
Taos, New Mexico