Which lens to buy?
Hi All, I am starting to look at lenses for birds photography. Below is what I am thinking of: 1. 300mm f2.8 IS mark 1 and 2x converter2. 400mm f2.8 IS mark 1 and 1.4 converter3. 500mm f4 IS and 1.4 converter The reason I mentioned the 300 and 400 ar...