The Canon 85mm 1.8 delivers better out of focus backgrounds and nicer bokeh, with much more blur.
At fixed, non-macro distances, depth of field is approximately inversely proportional to the square of the focal length, while it is directly proportional only to the first power of the f-number.
So the 85mm lens gives approximately 2.89 times more blur at equivalent f-numbers.
« Last Edit: December 21, 2012, 08:58:33 PM by helpful »
5DIII, 5DII, 7D x5, 6D, T2i, T3, 1D X, 10-22mm, 16-35mm II, 18-55mm II, 18-135mm IS x2, 70-200mm f/2.8L II, 24mm f/1.4L II, 50mm f/1.4, 50mm 1/1.8 II x2, 85mm f/1.8 x2, 100mm f/2 x2, 135mm f/2L x2, 200mm f/2.8L II x2, 1.4X III, 2.0X II, 60mm f/2.8 Macro, etc. only had room to list a few Canon items