Dan, I have the Tamron 75-300 LD and it is rather soft at the 200 to 300mm end. I intend selling it off. Try and get the Sigma APO 70-300 $ 160 used at KEH EX+ grade, which is better. I have taken test shots from my neighbor's lens and it is far better than the Tamron. The Pentax SMC DAL 50-200 is the better of the lot. If at any time you plan on a FF body then the Pentax SMC F 80-200mm would come in handy. For this reason I have avoided buying DA lenses. Until and unless you make clear your genre of photography, any advice will be very limited. Example I am into travel/street/cityscapes/general event/architectural photography, so the Sigma 10-20 is the most useful lens, especially on my very recent trip to Europe - monumental and huge buildings, churches, towers and spires in narrow squares and streets. I intend buying the FF Tamron 24-70 f2.8 to replace the Kit lens. And Dan, I am not getting any younger - failing eyesight, shaky hands - so AF lenses are a must. I do have the Tamron AF 28-200, Tamron AF 75-300mm and a Sigma 600/f8 mirror, but hardly use them 6% of the time. Regards. Bipin - from a far away enchanting land.
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