Quote: jeffrey r: Well, I do think I have the best of both worlds with plenty of my lenses. But I've also seen some people gripe to some degree about the bokeh of most of my lenses, so I think it comes down to personal taste, expectations, etc. My smoothest bokeh though clearly comes from my DA* 50-135, and that lens certainly has the sharpness as well.
When we discuss bokeh, like other subjects in photography, we need to be careful by keeping the discussion relevant. Towards this end, we need to stick with the apples to apples equation. A 17-50mm focal range vs a 50-135mm focal range is not apples to apples. Bokeh is related to DOF: in turn. DOF in a shot is determined by three things; focal length, aperture, and focus distance. The longer the focal length, the shallower the DOF will be for at a given aperture and focus distance. Simply put, telephoto lenses have shallower DOF than wide angle lenses.
So, for example, to compare the bokeh of a 17-50mm wide angle lens to a 50-135mm medium telephoto lens is not apples to apples. Just like comparing the bokeh of 50-135mm lens to a 300mm 2.8 lens would not be relevant. Simply put, wide angle lenses are known for their great DOF and this fits their applications. Telephoto lenses will have shallower DOF than wide angle lenses for a given aperture and focus distance. Even when comparing similar focal lengths, the apertures must be kept apples to apples since larger apertures produce shallower DOF.
The owner of this thread did not open it to a discussion of bokeh; rather, he was concerned about whether the Tamron 17-50mm lens could hold up to the contrast and sharpness of his Takumars. This thread has shown that the Tamron, indeed, can do that.
After that was shown, a peculiar act of hijacking occurred.