Subject: Re: Physical size of lenses
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! )