Focus accuracy with AF-S Nikkor 35mm f/1.4 G
We've had a Nikon AF-S Nikkor 35mm f/1.4G in from Nikon for a while and Datacolor recently sent a SpyderLENSCAL for review, so with the controversy over the AF performance of some copies, we thought we would post some sample shots taken at f/1.4 using the camera's phase-detection (viewfinder) AF mode.
The SpyderLENSCAL is a test target for calibrating lens/camera focus accuracy. You simply photograph the target and read-off the point of actual focus from the fixed ruler to the left.
This is a close up of the image above, which was a crop at 1:1 taken from a distance of about 3 or 4 feet. You can see some longitudinal chromatic aberration, but the AF accuracy is spot on. The lens was manually set to the minimum focus distance, and then the shutter button was pressed to initiate AF and capture the picture, as you would take a shot hand-held (the D700 was actually on a tripod).
The same procedure was repeated with the lens set to to infinity this time (and repeated several times over - I might add).
This is the close up of the crop above - with a similar result to the first. I would say this combination was working well, I can see no reason to adjust it. Note the slight axial (longitudinal) chromatic aberration, though.