Summary: I was looking for a video lens that would give me a nice wide-angle to long telephoto to use on my Canon 7D without much bulk and at a reasonable price. I priced the Canon equivelant and even the used lenses (on e-bay) were a couple hundred dollars more than I wanted to pay. I have several Sigma lenses and, while they might lack some of the features of the Canon lenses, they are sharp and generally pretty durable.
Summary: I can't write a review about this lens because it didn't fit my camera. it needed an adapter. Make sure you ask questions before buying I didn't ask had to find out the hard way. there are adapters that will fit the lens.
Summary: Good lenses for the price. some aberrations but easely to correct in Lightroom. in general I found this lenses very versatile giving me the oportunity of travel light. if you have a 35 and a good zoom you'll have all you want for your SLR.
Summary: This is an EXCELLENT lens and has become my "workhorse" lens. Although it may not perform optically as good as its more expensive cousins in the industry, it comes darn close and it can't be beat for price and quality as a general-purpose lens. Unless you are a seasoned pro who is meticulous about minute details and willing to drop a few thousand on professional equipment, this lens is for you.