Quote:
Originally Posted by avandonk
Thanks Dennis. What is more evil I reckon I can get a 150mm F5 Achro to perform like an APO by using filters and knowing where focus is for a given wavelength. The only complicating factor is does field curvature vary with wavelength? As far as I know it should not.
Next set of experiments!
Bert
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It does... this depends on the optical design, though. And the effects are more prominent away from the optical axis.