GoofyNewfie wrote:
I have had a couple of great experiences with the EX line of Sigma lenses a d would buy an EX again, but this in not an EX. Great specs though. One thing I noticed was, along with providing the full-frame equivalent info, Sigma also gives the full-frame equivalent aperture, in terms of depth of field, as well. I think that says a lot about the company.
"Equiv. aperture: f/4.2-f/6 (full format equivalent, in terms of depth-of-field)"
I don't understand that. Surely the aperture and depth of field are the same whatever you mount it on, and don't have an equivalent in the same way as focal length/picture angle?