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 we looked at the five lenses’ bokeh in a scene without… [Read More]
Archives for March 2016
Another medium tele test — Bokeh
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. It’s time to take a look at bokeh. I’ll organize this by… [Read More]
Getting to the point of best focus from raw MTF50 curves
When you focus using the LCD screen or an attached monitor, with or without the peaking enabled, you are focusing on luminance. And that’s appropriate, since human contrast sensitivity functions allow us to see fine image detail by seeing changes in luminance. But I’ve been reporting on the peaks in raw color planes. How does… [Read More]
Another medium tele test — Batis AF vs MF
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. When John Henry was a little baby sittin’ on his daddy’s knee… [Read More]
a7RII LoCA & AF vs color plane — Sony 70-200/4
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]