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From: android <here@there.was>
Subject: Re: Physical size of lenses
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From: android <here@there.was>
Newsgroups: rec.photo.digital
Subject: Re: Physical size of lenses
Date: Wed, 29 Nov 2017 18:30:59 +0100
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On  2017-11-29 11:09, Paul Carmichael wrote:
> Good morning everyone.
> 
> I have a trivial question:
> 
> 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.
> 
> 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.
> 
Making an 85 can pretty straight forward but a 35 FF SLR requires a 
technology called retro focus, thus giving you sorta two lenses in one! :-))

<https://photo.stackexchange.com/questions/26493/retrofocus-lens-what...

<http://tinyurl.com/ycbepfga>
-- 
teleportation kills