Imatest, the company who makes the software that I use to measure the modulation transfer function (MTF) of camera/lens combinations, expects you to fill the frame with one of their test charts, carefully align the camera so that the lens axis in perpendicular to the chart plane (or, equivalently, so the chart and sensor planes… [Read More]
Archives for 2015
Sony 70-200/4 on an a7RII, Nikon 70-20/2.8 on a D810
Last week, I posted some images that compared the performance of the Nikon 70-200 f/2.8 GII ED to the Sony 70-200 f/4 G OSS FE when both were mounted to a Sony a7RII. Part of the controversy related to whether eyeballing images was a useful way to compare lenses when MTF curves were available. Well,… [Read More]
a7Rii, D810 flash synch revisited
Yesterday, I made two posts aimed at discerning whether EFCS affected the maximum flash synch speed in the Sony a7RII and the Nikon D810. The answer was that EFCS made no difference, but there was an anomaly revealed in the testing: neither camera appeared to synch perfectly at its maximum specified synch speed. I figured… [Read More]
D810 EFCS and flash synch
Earlier today, I posted the results of a test of the maximum synch speed of the Sony a7RII with both EFCS on and EFCS off. It appeared that the camera’s true synch speed was 1/200 second in both modes. That got me wondering. Would the D810, with a specified synch speed of 1/320 second, fare… [Read More]
Mixing and matching lenses and cameras
In response to yesterday’s Nikon/Sony 70-200 testing, a reader commented: Isn’t it established that Sony lenses are optimized for the Sony sensor and vice versa. (although more skewed against WA due to Sony’s sensor lenses and thickness. Putting the Nikon on the Sony is a little like putting P-Zero’s on a Prius. I don’t believe… [Read More]
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