Sigma lense

Welcome to the another digital photography school tutorial on understanding focal length. It's not so long away when I entered magical world of Digital SLR photography, until then I was using simple compact sized cameras and did with them a simple thing - photographed things. Well, things...

There is a huge sale going on on Amazon for Canon mount lenses. I'm not an expert in photography, it has been just a while since I'm a lucky owner of my first Canon DSRL camera, and it has been not so while (about a week) since I own another telephoto lens, which is Sigma branded for my camera...