This lens is fucking sweet. It costs more than a full suspension mountain bike and is worth every cent. All those cents buy a constant aperature zoom that is faster than a blown Supra and sharper than a set of Henckels knives.

The lens also features silentwave autofocus that is is unfuckingbelievable. I first experienced the magic of silentwave while shooting the fashion show at The Hair Ball. Every single damn one of my shots came out in focus. Due to the low lighting and the movement of the models, I expected to lose about 70 percent of my shots. For photographers who are $1,700 worth of serious, I highly recommend this lens.