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From: nospam <nospam@nospam.invalid>
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Subject: Re: Physical size of lenses
Date: Wed, 29 Nov 2017 10:25:12 -0500
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In article<f87fa0Fh1fjU1@mid.individual.net>, Paul Carmichael<wibbleypants@gmail.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.