Can anyone give me a comparison of these two lenses' optical quality? Or I should say, is the extra stop of light from the Tokina worth it? I know we've kind-of been here before, but I'm quite happy with the Pentax, and may just wait till I can afford the FA* 28-70/2.8, if the quality of the Tokina is significantly poorer than the 29-70/4. Thanks!
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