March 21, 2009 March 21, 2009 in 365, Photos I've got your back The tundra swans are back at the Thedford bog for a few more days. Bring your binoculars or high-powered lens. Camera: Canon EOS 50D Lens: Canon EF 100-400 f4.5-5.6 Light: Existing ISO: 400 Exposure: f6.3 @ 1/2000 sec.