Sony Zeiss Lenses


Compared to Planar designs the Sonnars had more aberrations, but with fewer glass-to-air surfaces it had better contrast and less flare.

While very sharp, the Planar lens suffered from flare due to its many air-to-glass surfaces. In the 1950s, when effective anti-reflective lens coatings became available, coated Planars were produced with much-improved flare.
Also, the Sonnar and Planar lens designs are used for different types of focal lengths.

The Planar design is better for fixed focal length.
The Vario-Sonnar is better for zoom lenses.

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