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The onloy thing you're no considering is the 55-300 is an extremely sharp lens and overlap wise provides the least amount of overlap with the new kit lens. The 55-300 is designed to be sharper edge to edge for the K20D and I don't think any of the Tamron super zooms will compete with contrast and sharpness with this lens. It's just my opinion but I loved it and the build quality is great.
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-Chris... your friendly neighborhood Moderator
Pentax K20D & K10D | Pentax LX | Pentax DA* 16-50mm 2.8 | Pentax DA* 50-135mm 2.8 | Pentax FA 50mm 1.4 | Pentax AF540 flash | Pentax AF360 flash | Sigma 28mm 1.8 | Sigma 105mm 2.8 Macro | Tamron 70-300mm Di 4.5-5.6 |
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