Originally Posted by
Chris White
They are both f/2.8 which I shoot more than not. In addition, it gives me that creamy background blur you are looking for, which helps draw you to the subject.
Just keep in mind that there are two aspects to 'creamy background blur' -
quantity of OOF blur (i.e. thin DoF) and
quality of OOF blur (aka bokeh). Both lenses produce a nice, smooth bokeh. As for quantity, it depends on how tightly you frame - DoF is determined by subject distance, aperture, and focal length. For a given subject distance (e.g. 3 m), 105mm at f/4 results in a thinner DoF (~35%) and thus more OOF blur than 70mm f/2.8. Of course, the framing is tighter, too. But my point is that you can get good OOF blur with either 24-xx zoom (although nowhere near what you'll get with the 85L).
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