The Sigma 70-200 is an amazing lens, but just how amazing?
Just recently I read a lens review where the person writing the review said, “Sharpness is not something I normally notice on a lens.” To this point all I can say is, wait, what?
How can any photographer, specifically one who is writing a review of a lens, not notice how sharp a lens is? Maybe I’m wrong, but when shopping for a new lens, isn’t the sharpness of a lens just as important as it’s focal length?
For this review, I am talking specifically about the sharpness. Even more specifically, the sharpness at it’s widest aperture setting of f/2.8. I am also testing it’s sharpness with OS (optical stabilization) both on and off.
First, let’s take a look at a real world application for a lens like the 70-200 — A wedding. Weddings are a great test bed because you need a lens that can give you a sharp, great looking image in conditions you often can’t plan for. A common rule when shooting with a telephoto lens is to have your shutter speed match, if not exceed the focal length of your lens. So, if shooting at 200mm, you’d ideally have a shutter speed around 1/250. A rule like this is easy to follow if you can plan for the situation you’re shooting in, but when working a fast paced job, like a wedding, you may not always be able to comply with a rule like this. That’s why a lens with optical stabilization (also known as IS, or VC) can be so important.