Borrow Lenses is running an offer for 10 free rental days when you rent for 10 days starting Dec 10th. So you get 20 days for the price of 10. Just in case you were thinking of renting a big gun over the holidays. I went cheap and rented a Tamron 200-500mm just to see how it does. The code is FREEWEEK13. Must be ordered by the 5th with delivery on the 10th.