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I think context is required to determine the extent to which the ca is going to degrade resolution. The discussion really should include a measure of encircled energy ratio. If it is only 10 or 20% of the sampled spectrum that falls outside of your sampling limit then it probably wont even be noticeable... you also should weight that figure using the spectral sensitivity curve of the chip and keep in mind that each individual colour channel will be ostensibly free of ca assuming you refocus for each filtered image. The merit function of AO then reduces to a question of whether the bloating of star images due to ca (in the L channel only) is of greater extent than sub 10hz image wander due to mechanical & seeing issues.
My gut feeling is you will still be ahead with AO more often than not.
best,
c
Last edited by clive milne; 09-12-2013 at 11:30 PM.
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