It's recommended to MFA a lens at it's widest aperture, and I think that 50L gives the AF system issues due to the DOF of f/1.2 being smaller than the tolerance of the AF system. I plan to redo the 135L testing, this time from a correct, large distance.ĦD, Tamron 24-70 f2.8 VC, 135L, 70-200 f4L, 50mm f1.8 STM, Samyang 8mm fisheye, home studio ![]() My other fast lens, 135L, looked fine at -1 MA, but I noticed recently that for my main usage of the lens (full height portraits, meaning you have to be really far, with my crop camera), f/2.0 shots are always very slightly off. My newest zoom, Sigma 17-50 OS, was tested to work fine at -2 MA, in real life environment. with a few shots at each zoom and each distance you can get a pretty good feel on what MA is needed. I didn't even need to use a tripod, remote shutter release, mirror lockup etc. Then I discovered that I get better results by hanging a large printed target on a wall in my backyard, and shooting it from realistic distances on a sunny day. ) of my lenses, and was never happy with the real life results. I spent a lot of time doing indoor testing (printed targets, computer monitor with moire patterns. ![]() From my experience, for best results in focus MA, one really needs to have the environment as close to real life shooting as possible - meaning both correct light (use daylight, not fluorescent / LED / tungsten), and distances (if the typical use of the lens is full-height portraits, the size and the distance to the printed target should be chosen accordingly).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |