Tamron 17-50 does okay for bokeh. I have no experience with the Tamron 28-75 though. Prime doesn't automatically mean good bokeh; nor does large aperture. What mount do you use? Nikon F? Canon, Sony, etc.? You may have better alternatives in your native mount.
We had a brief look at the quality of the bokeh (out-of-focus blur) at 50mm. The blur is generally very smooth both in the fore- and background. Bright out-of-focus highlights can produce an outlining effect at f/2.8 although the effect improves at f/4.
Tamrons can produce decent bokeh, but usually nothing amazing. Some variants have "onion" bokeh. Here is 17-50 on a crop camera:
Tamron AF 17-50mm f/2.8 SP XR Di II LD VC
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But, if I am using a crop sensor, would I be better off with a 35mm? 40mm? Is one of the Canon mount primes by anyone, Sigma, Tamron, etc... a particularly sweet lense?
But, if I am using a crop sensor, would I be better off with a 35mm? 40mm? Is one of the Canon mount primes by anyone, Sigma, Tamron, etc... a particularly sweet lense?