Taking the exact same data from the previous post and putting into the 16-exposure packets that we’ve been using for MTF testing, we get the following for Nikon equipment manually focused (to keep things simple, I’ll just show you the normalized results): That’s the kind of variation that’s just built into the protocol and the… [Read More]
Archives for October 17, 2015
MTF testing of 70-200mm lenses — fundamental effects, part 1
In the past few posts on MTF testing, we’ve seen so many things that affect the Imatest MTF50 results that it’s reasonable to look at tests that change very little to find out how much instability there is in the baseline test protocol and the image analysis tools. I made 128 exposures at f/4 with… [Read More]