The second part of the evaluation of the FA 77mm lens was to photograph a scene at different apertures and observe the CA/PF effects.
I set up the camera on the tripod and photographed the scene across the street.
This is what the scene looks like:
I shot this at every aperture setting for the lens. I have selected a few of them covering the range from F1.8 to F11 and show the crops around the patio railings on the top left corner of the building.
The CA/PF effects get less noticeable as the aperture gets smaller.
Here is F1.8
This of course is equivalent to a 16 inch print viewed very closely (pixel peeping). In reality the first image, even when viewed from a few feet away at an 8 X 12 size is very difficult to see the PF on the railing.
Next is F2.5
Personally, I can accept the performance of the lens at F2.5. The picture is sharper at F5 and above, and I think I would for heavily backlit subjects which do not need a shallow depth of field use the f4 or higher aperture. I think with careful planning and understanding of the performance of the lens, the CA/PF issue can be minimized.