Leica 25mm f/1.4 - Pictorial Review

Started Apr 18, 2013 | Discussions thread
David Kieltyka
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In reply to clengman, Apr 19, 2013

Pretty much every 50mm f/2 lens made between the early 1970s and the development of affordable aspherical element manufacturing techniques used the same double-gauss optical design. Each maker tweaked it a bit and maybe gave it a different name (Zeiss "Planar" or Leitz "Summicron"), or no name at all, but they were all close variants of each other.

The same thing is happening with today's computer-driven designs. They're converging due to different companies using the same, or very similar, design algorithms. I think this sentence in the Sigma link you provided is crucial: "My guess is that Sigma may want to release a much cheaper alternative of the excellent Panasonic Leica 25mm f/1.4 lens." But that doesn't mean the Sigma is an intentional copy of the Pana/Leica design...or vice versa.

-Dave-

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