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Latest Review Posted SMC Pentax-DA 18-270mm F3.5-6.3 ED SDM
This is a good review with a fair conclusion.


I have the earlier version of the Tamron model (18 - 250mm) on my Pentax KR and this version (Tamron) on my Nikon 5100. The Tamron version may have different lens coatings compared to the Pentax badge but the internal components will be the same, judging by the distortion and sharpness characteristics


Both lens models have the same problem viz. inaccurate auto focusing from 18mm to around 50mm. However, they focus well with Live View. I see that the reviewer noted that the distance scale on the lens was inaccurate at close range - this may be related to the problem I have found. On AF, the lenses focus at a different distance to what I can measure with a tape measure. SInce two models of this lens show the same problem but on two different cameras, I think that the AF systems of the respective cameras may be implicated - not accurate enough for the soft focus seen at wide angle. It would be interesting iof any K5 or K30 users observe the same problem.


The net result though is that I cannot relly on AF to give me sharp/accurate focus between 18 and 50mm FL.



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