Benjamin Marks
Veteran
Willie: Awesome description. Very useful. - Ben
Peter^
Well-known
Willie,
good information.
Just one addition (the point i was trying to make above): longitudanal CA has a direct effect on the overall resolving ability of a lens. High CA means poor sharpness. CA also increases for rays passing through the periphery of the lens (because they are refracted more). Which is why resoltution tends to decrease at large aperatures.
good information.
Just one addition (the point i was trying to make above): longitudanal CA has a direct effect on the overall resolving ability of a lens. High CA means poor sharpness. CA also increases for rays passing through the periphery of the lens (because they are refracted more). Which is why resoltution tends to decrease at large aperatures.
back alley
IMAGES
thanks for all the info folks!!!
i have decided to formally ignore ca of any kind and just contimue blindly shooting away...
i have decided to formally ignore ca of any kind and just contimue blindly shooting away...
N
Nikon Bob
Guest
pvdhaar
Peter
It's not like CA is something new. In the 70's I had a 300/5.6 that suffered from bad CA. Red/green would end up different places the further away from the center and focus point you looked. Stepping down would improve things, so I shot it at f11 if possible. Obviously, this lens was from before APO glass became available.