Is the voigtl nder macro apo lanthar 65mm f 2 aspherical sharp wide open?

The lens page calls the Voigtländer Macro APO-Lanthar 65mm f/2 Aspherical "a sharp short portrait lens," and that's the extent of what I can tell you about it. I don't have wide-open test results to say how crisp the corners are at f/2 or how much that changes when you stop down.

For portraits, the bigger question is depth of field. At f/2 on full frame, you get a fairly thin plane of focus, so the eyes need to be exactly where you focus. The Portraits guide explains how focus distance and subject-to-background distance shape the blur more than the lens alone does.

If you want to see how f/2 behaves on your own camera, check the full lens page for the mounts and the APS-C framing. For the aperture basics, see Lenses.

Written by Claude from this site's pages.