Why do YOU use fast primes?

Started Aug 11, 2013 | Discussions thread
mg_k Senior Member • Posts: 2,812
Re: 16-200mm?

joger wrote

Let's say you photograph a normal sized human being (full size in FF)

At 200 mm you'll get a distance of roughly 12 m. The DOF at f/2.8 is roughly 0.6 m - at f/2.0 it is 0.4 m

Let's go to 35 mm - the same person can stand at a distance of some 2 m. At f/2.8 the DOF is some 0.55 m and at f/1.4 still some 0.27 m - sure - a slightly bigger difference but not much.

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It's not just about the difference in DOF but the background/oof area.

Try shooting an identical scene with a 35mm, both at f2.8 and f1.4, there will be more pronounced difference in terms of the oof area compared to say f2.8 vs f2 @ 200mm.

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