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500mm vs 600mm?

Started Nov 13, 2017 | Questions thread
ffabrici Senior Member • Posts: 1,353
Re: The 800mm

Hi Tazz,

The f/5.6 max aperture was actually a big concern to me before I finally decided to buy the 800L, but after getting a 5DIII (and later 5DIV) it has not been a problem to me due to their ISO 400+ performance.

The 800L is sharp wide open with a tiny bit of vignetting, which disappears at f/6.3. Optical peak performance is between f/6.3 and f/8, and it starts to loose some contrast after f/11, which can easily be fixed in post.

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