Here's what Bjørn Rørslett has to say about the Sonnar (pre-1972) version of the F-mount 105/2.5: "The Sonnar is easily identified by its smallish rear element compared to more recent versions. It was an extremely sharp lens for its time and the optical quality still surpasses that of many modern lenses. It underwent cosmetic changes of the exterior only and stayed in production until 1971. It is a great performer at f/5.6 and provides for good performance even wide open, but flare could be a problem here."
Sonnar's are known for having high field curvature. It does not do well for flat objects, but this can be an advantage for taking portraits.
I am a Sonnar fanatic. I have ten Zeiss Sonnar 50 F1.5's alone, all a little bit different. I have even more Nikkor 5cm F1.4's, mostly to go with Nikon RF's.
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