Roger Cicala has posted a (typically) wonderful article on quality assurance in lens design and manufacturing. There’s something that Roger points out about the engineering/manufacturing feedback loop that’s worth a little attention. What follows is my take on it, not necessarily Roger’s. During pilot runs, engineering gets feedback from the line and from alpha, testing… [Read More]
For photo-nerds only — LSF
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. A reader thought that point spread functions (PSFs) might be better for… [Read More]
Another medium tele test — more on-axis color fringing
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. In the preceding post, I reported on some left/right color fringing with… [Read More]
Another medium tele test — color fringing
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. I’ll get back to the MTF stuff before this test is over,… [Read More]
Another medium tele test — MTF
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. I reprocessed the 3.5-meter DCRAW-developed test shots from the lateral chromatic aberration… [Read More]
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