If you've ever wanted to get your hands on expensive, specialty glass for a test drive before purchasing or to fulfill s short-term need, check out lensrentals.com. I've rented the Canon EOS 300mm f2.8, 2x and Wimberly II head to take to Yellowstone and a Canon EF-S 10-22mm f/3.5-4.5 for slot canyons in Arizona. You can rent the lens with damage waiver coverage too which is not a bad idea when you are holding a lens you can't normally afford. Why risk having to buy one as a replacement when you can't justify buying it for yourself?