Best legacy 35 mm

Started May 20, 2013 | Discussions thread
fermy Veteran Member • Posts: 3,168
Re: Best legacy 35 mm

sebboh wrote:

biogon is just zeiss's name for wide angle lenses with a symmetric optical design and planar is zeiss's name for lenses with a double gauss design. both are ostensibly symmetric designs (in practice neither are actually fully symmetrical), but the double gauss (planar) is the simplest of the symmetric designs that zeiss employs in modern lenses and is usually used on longer lenses which are easier to design and thus require less complexity.

if you think that the contax g 35/2 planar is not a much simpler design than the zm 35/2 biogon i suggest you take a look at the lens diagrams on zeiss's website. it is quite clear that zeiss did not use the g35 design as a starting point for the zm 35/2.

Unless special glass is involved, the complexity of design is just the number of elements. Both 35mm f2 planar and 28 f2.8 Biogon Contax G lenses  are 7 elements in 5 groups, no special glass, exactly the same complexity to calculate and produce. Modern Zeiss ZM 35/2 Biogon is 9 lenses in 6 groups, certainly more complex than both Contax G lenses. First 35 f2.8 Biogon for pre-war Contax RF was yet simpler: 6 elements in 4 groups.

As it is plain to see from above, the complexity of the lens has nothing to do with whether the lens is called Planar or Biogon.

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