I was thinking of going ahead and buying this lens. It's about the only missing focal range in my collection that I feel I need. I also have a mini project that will pay for itself taking shots of a new building that is going to be constructed and the project is a time lapse project of the progression. I have a 24-70 but I frequently have to stitch 2-4 photos together when doing this type of project in the past which is kind of a hassle. So, I would like some comments good and bad on this lens if you have experience with it. Secondly, I'd like similar comments w/ dealing w/ sigma4less aka photo4less. I've been tempted to order from them in the past, but have always stuck w/ b/h but they are $50 less on this lens. So thoughts about dealing w/ them? They have a decent (8.5) rating on resellerratings.com.