BrianV
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The Sonnar formula lens appeared on the market for the Contax RF camera of the 1930s. The design optimized transmission of light by minimizing the number of optical surfaces. The lens is in three groups, two sections. The front section is a telephoto lens with a focal length about 2.5times the focal length of the completed lens. The rear section is about the same focal length of the completed lens. The spacing between the two sections is small, and the overall lens is very compact. The back-focus of Sonnar lenses is relatively short, and lenses with focal length less than about 100mm never made it to the world of SLR's. Basically, they are in the domain of the mirrorless camera.
The Nikkor 5cm F1.4 is the first Sonnar lens faster than F1.5, appeared on the market in 1950. Made in Leica thread mount, it has an 18" minimum focus. Also available in Nikon "S-Mount", and can be used with an adapter on mirrorless cameras. The RF coupling on the LTM lens goes to 0.9m, can be modified for 0.7m
On the EP2, used with an adapter, the 18" minimum focus is quite useful. Wide-open, lighting from a flat-panel display at a Museum.
The Nikkor 5cm F1.4 is the first Sonnar lens faster than F1.5, appeared on the market in 1950. Made in Leica thread mount, it has an 18" minimum focus. Also available in Nikon "S-Mount", and can be used with an adapter on mirrorless cameras. The RF coupling on the LTM lens goes to 0.9m, can be modified for 0.7m
On the EP2, used with an adapter, the 18" minimum focus is quite useful. Wide-open, lighting from a flat-panel display at a Museum.
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