09-23-2015, 03:14 PM
"It is worth to note that the close focus performance seems to be a bit worse though (just from visual observation)."
That is most probably true. Wide open, the lens is pretty sharp also in the corners, just not when you are making close ups. The MTF testing is done at a relatively close focus distance due to the short focal length, so that may explain the less than good corners.
Using the lens with a 10mm extension tube does show it gets progressively worse with shorter distances.
That is most probably true. Wide open, the lens is pretty sharp also in the corners, just not when you are making close ups. The MTF testing is done at a relatively close focus distance due to the short focal length, so that may explain the less than good corners.
Using the lens with a 10mm extension tube does show it gets progressively worse with shorter distances.