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 looked at on-axis focus shift with the Sony 90mm f/2.8… [Read More]
Archives for February 2016
Another medium tele test — measuring focus shift
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 my lens testing, I have been focusing wide open no matter… [Read More]
Another medium tele test — toward a direct LoCA metric
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’ve so far been unsuccessful in measuring longitudinal chromatic aberration (LoCA) directly…. [Read More]
A book report — embossing the cover
This is a continuation of a series of posts that I started what seems like a long time ago about getting a book designed and published. The series starts here. I met with Jerry Takigawa about the printing on the cover of the book and the portfolio slipcase. He showed me his idea, and I… [Read More]
Lens quality control
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]
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