Tom Hoskinson
Member
I've read that the Biogon 21mm is indeed a retrofocus design, based on its light falloff chart, but not as retrofocus as the Distagon.
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I do know that the Leica 21mm Elmarit is retrofocus though, because they said so themselves.
Elmarit-M 21 mm ASPH Technical Data_en
http://en.leica-camera.com/photography/m_system/lenses/2177.html
In the above Leica reference, the only thing that relates to retrofocus design is given by the lens diagram itself, which shows a non-retrofocus Biogon Type lens design with one Asphere element.
Both of the current ZM Biogon lenses are non-retrofocus near symmetric lens designs according to the Zeiss literature.
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