In article<f87fa0Fh1fjU1@mid.individual.net>, Paul Carmichael<email@example.com> wrote: > On my desk in front of me are two lenses. Both Samyang primes. One is a 35mm > f1.4 and the other is an 85mm f1.4. > > I'm just curious as to why the 35mm is so much physically longer than the > 85mm. retrofocus design more here: <https://www.lensrentals.com/blog/media/2011/03/zeisscompare.jpg> <https://www.lensrentals.com/blog/2011/03/the-development-of-wide-ang... lenses/> > And a related question: I have a Vivitar 35mm f2.8 that fits in the palm of > my hand, > whereas the Samyang is huge. I suspect the answer is obvious, but not to me. it's a much slower lens.