Best legacy 35 mm

Started May 20, 2013 | Discussions thread
sebboh Contributing Member • Posts: 559
Re: Best legacy 35 mm

fermy wrote:

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.

yes, complexity has nothing to do with whether a lens is called planar or biogon. a modern biogon lens is more likely to be complex though because it is not limited to the double gauss design. if you look at all zeiss's current catalog you'll see that on average biogons tend to be more complex (and distagons tend to be even more complex). for the specific lenses i was talking about the zm 35/2 biogon is obviously more complex than g35 planar. my original point for stressing that one was a biogon and one was a planar was to point out that they are different designs and that one is not derived from the other, not so say that biogons are always more complex than planars.

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