Quote:
Originally Posted by rally
Stefan,
I asked because the only CDK corrector lens assembly I have ever seen in real life was off a Planewave 20" and it was an extremely deep meniscus doublet that I believe was aspheric - so this seemed to me to be a horribly complex lens assembly that even the experts were getting wrong !
My understanding was that ultimately they changed to a European optician to get it right.
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As far as I know Planewave use a 3 element corrector made of 2 different types of glass, but my guess is that the only reason for that extra complication is to achieve the large field needed for 36x36 sensors.