Upload & Sell: On
| p.1 #5 · Great article on lens variations |
A fine piece of work.
Perhaps I missed this in the article on my quick scan, but do they mention the aperture at which those data plots were created?
Those were all wide open (f/2.8).
That's a good point about distance, Denoir: with the testing set up we have I can test at 3 different distances (at 100mm it would be abou 6 feet minimum, 12 feet, and 15 feet). The test mentioned above was at 12 feet.
However, the Imatest data is for 32 points over the field of view, and I graphed it as peak MTF50 (single point) vs weighted average MTF50 of the entire FOV. A full-field MTF analysis bench would be more accurate (and eliminate camera variability). That's in my dreams, but with the automated benches going for >$100,000 my dreams is where it will stay for quite a while.