If not mistaken, 50mm is about 1x, as in telescopes and binoculars. That is assuming a 1/1 shot with a 50mm, 200 mm would give you about 4x magnification, etc.(200/50=4). If this is incorrect info, someone please correct me! Anyhoo..I do have a 300mm and it doesn't reach out like my everyday binoculars but then again, I can't get photos through them and the f value would be terrible if I tried!