I don’t have equipment to quantitatively test the dynamics of autofocus systems. It has been my experience that the dynamics are what differentiate one phase detection AF system from another, for the most part. Properly adjusted — and, if necessary, tweaked for each lens and distance range — they all seem to focus about as accurately,… [Read More]
Archives for July 30, 2014
EFCS results with a 400mm f/2.8 lens on a D810
Next up, in the series of lenses that I’m using for EFCS testing on the D810: the Nikon AF-S 400mm f/2.8 D II. Not a VR lens; the one just before the Canon patents ran out. I started at f/5 at 1/500 and worked down in 1/3 stop intervals. The results, measured for horizontal edges:… [Read More]