Is the leica super apo summicron sl 21mm f 2 asph sharp wide open?

The site doesn't have sharpness test results for this lens, so I can't tell you how it performs wide open at f/2. I'd rather not guess.

What I can tell you is what the lens is: a 21mm f/2 prime for full frame, with autofocus and no stabilisation. On full frame it frames as a true 21mm, and on APS-C it behaves like a 32mm with about the depth of field of f/3. You can see the full spec list and the list of compatible cameras on its lens page.

For a feel for what f/2 does to your pictures, the aperture guide explains how the f-number affects light and background blur.

Written by Claude from this site's pages.