Is a FF camera worth it for these reasons? Locked

Started May 21, 2014 | Discussions thread
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Great Bustard Forum Pro • Posts: 40,863
Re: Maybe

Mako2011 wrote:

Great Bustard wrote:

Mako2011 wrote:

qianp2k wrote:

My point is that,

if APS-C lens is equally well designed and optimized on APS-C, then it will perform better than a FF lens designed and optimized on an APS-C camera with the same or similar FL on the same FF eq spec such as a F1.8 lens on APS-C vs a F2.8 lens on FF;

If a FF lens is, as you say, also a lens designed and optimized on an APS-C camera, then likely it will perform better than a APS-C only lens on APS-C. The things that make any FF lens great...often carry over when same lens is mounted on APS-C. Great FF lens, with rare exceptions, don't often become "poor" when mounted on APS-C. That's part of the reason you don't see many truly great APS-C only lenses.

Hmm. I think it might be a lot easier to design a sharper lens for a smaller image circle.

I thought about that. But might actually be easier (from manufacturing standpoint) to start with a FF lens and insure the area projecting on to the smaller APS-c image circle is sharp and free of aberrations across the APS-C frame than manufacture a smaller lens that is as good center to edge.

I'm thinking the Sigma 18-35 / 1.8 is a 27-63 / 2.8 FF lens with a 0.67x FR (focal reducer).  Not unlike how Olympus made their 14-35 / 2 and 35-100 / 2.

The longer the lens, the less the image circle matters, however. So, for example, a 70-200 / 2.8 specifically designed for APS-C would probably be no better, or even less expensive, than the 70-200 / 2.8s that exist for FF.

Agreed. Why I think (part of the reason) there are fewer outstanding APS-C only lenses

Lot's of APS-C users are screaming for fast APS-C wide primes, though.

However, if a 24 / 1.4 were designed specifically for APS-C, I think it would be sharper than the 24/1.4L II, for example, be smaller, and cost less. That said, it still wouldn't outperform the 35 / 2 IS on FF, methinks.

I think your on the right track there.

If you want the advantages of FF, best to just go FF rather than try to get FF performance in a smaller format.

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