showtm490 wrote in post #12111214
I own a 70-200 2.8 IS II and love it but after a day of shooting portraits the weight gets to me. I've been looking at the 135/2 and loving the dreamy bokeh and sharpness. My question is between the two, which produces it better....the 70-200 at 200 at f2.8 or the 135 at f2?
If you shoot both the 70-200 at 135mm and f/2.8 vs. the 135L at f/2.8, the aesthetic appearance of the blurred region (the bokeh) will be very similar. You may read people here claiming one or the other is better, but these people must really be splitting hairs. Neither lens has any traits (bright circle ringing, doubling of lines, coma effects) that will be obvious with almost any background.
If you shoot both lenses wide open at 135mm, the prime will blur the background a bit more (due to the extra stop). This effect will usually be subtle as f2 to f/2.8 is pretty fast at 135mm.
If you shoot both lenses wide open and use the zoom at 200mm, the zoom will blur the background a very small amount more (assuming you backed up for common framing).
IMO the degree and aesthetic of the blur is probably not a major issue between these lenses. I'd worry a lot more about size, weight and how much you need the versatile range of focal lengths.