While testing a group of medium tele lenses on the Sony a7RII, I came up with a way to examine longitudinal chromatic aberration (LoCA). Then I noticed that the a7RII’s autofocus (AF) optimized the red raw plane with the Batis 85. That seemed strange. I tested the Sony/Zeiss (Zony) 35mm f/2.8, the Zony 55/1.8, and… [Read More]
Archives for 2016
a7RII LoCA & AF vs color plane — Zony 55/1.8
While testing a group of medium tele lenses on tha Sony a7RII, I came up with a way to examine longitudinal chromatic aberration (LoCA). Then I noticed that the a7RII’s autofocus (AF) optimized the red raw plane with the Batis 85. That seemed strange. I tested the Sony/Zeiss (Zony) 35mm f/2.8 and the Sony 90mm… [Read More]
a7RII AF vs color plane — Zony 35/2.8
I’m taking a break from the medium tele testing to run down an AF anomaly I stumbled onto with the Batis 85/1.8 on the Sony a7RII. That lens has considerable longitudinal chromatic aberration (LoCA), and, when the camera is in autofocus (AF) mode, it focuses systematically in the wrong place, on the side of the… [Read More]
Another medium tele test — Batis AF with a new focus target
This is a continuation of a test of the following lenses on the Sony a7RII: Zeiss 85mm f/1.8 Batis. Zeiss 85mm f/1.4 Otus. Leica 90mm f/2 Apo Summicron-M ASPH. AF-S Nikkor 85mm f/1.4 G. Sony 90mm f/2.8 FE Macro. The test starts here. Horshack, a poster on DPR whose opinions and methods I respect, said… [Read More]
Another medium tele test — Sony 90 macro PDAF
This is a continuation of a test of the following lenses on the Sony a7RII: Zeiss 85mm f/1.8 Batis. Zeiss 85mm f/1.4 Otus. Leica 90mm f/2 Apo Summicron-M ASPH. AF-S Nikkor 85mm f/1.4 G. Sony 90mm f/2.8 FE Macro. The test starts here. Yesterday I reported on the curious behavior of the Batis 85/1.8 on… [Read More]
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