Excerpt: I really just want to comment on my initial impressions after receiving this lens kit (lens, filter, cleaning kit) yesterday evening.The Tiffen filter fits great and appears to be clear enough for my tastes, but I have not had a chance to check its quality yet.
Pros: Fast / accurate auto-focus, Nice Bokeh, Strong Construction
Excerpt: I normally use a standard fixed focal length lens and have several. But this lens changed my thinking. For the bulk of my work this lens will cover it and increases my working speed. The lens is super sharp. The images are far better than a couple of Nikon lenses I have.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Rugged, Strong Construction
Excerpt: This is my second Sigma lens. It allowed me to take pictures where the kit lens will not even take the shot. I can now take a picture without flash inside a restaurant at night. At half the price of an equivalent Nikon lens, I can't complain. The lens came with a nice pouch.
Summary: I bought this lens to go with my Canon T5i and I love it. This lens is very sharp and the auto focus is not too noisy. It takes great pictures but I use it mainly for videos. the 2.8 all range aperture is perfect for me.
Summary: Only used it for a month but very impressed with it. Focuses quickly and quietly, lovely to use. Only quibble is that it zooms the opposite way to pentax lenses - getting use to this, this is not a problem though.
Summary: I have been browsing though camera lenses that would suit well with my Canon 70D. I have considered purchasing the full frame 24-70mm 2.8 by Canon and Tamron, but instead I decided to go with the Sigma 17-50mm 2.8 EX DC OS seeing that it's better suited with my asp-c camera.