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| p.2 #7 · Zeiss 80-200mm 4.0 C/Y anyone? |
And one more, just to finish off
Note that this one needed a bit of RedGreen CA correction, but not the usual negative correction, it needed positive. A first for me..
Congratulations with your first one.
Otherwise it's not a big deal. Transverse chromatic aberration has properties in common with curvilinear distortion. Retrofocus wideangle designs, generally characterized by barrel distortion, require what you call a negative CA correction. Telephoto constructions, characterized by pincushion distortion, a positive CA correction. In a lens like the VS 4/80-200, both distortion and lateral color flip sign as you zoom from 80 to 200 mm. (Unfortunately the full story is more complex and there is no setting where all aberrations are absent )