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05-20-2013, 06:51 AM   #16
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QuoteOriginally posted by jlaubza Quote
This is an old post but other folk may look in for guidance.

I bought the Tamron 18 - 250mm lens a few years ago. In looking back through my pictures not one of them is really crisp, spot on sharp. Sharpness is a relative term - I can sharpen these images with software and make them looker crisper but the true fact about this lens is revealed by lens tests and it comes out as average for sharpness. That is my experience as well.

For a different camera brand, I bought the later 18 - 270mm PZD lens - much better than the earlier model - sharper, less CA and the PZ drive is terrific. I think however that Tamron does not make the 18 - 270mm model to fit Pentax - I write under correction on this point though. But if I am wrong, ignore the old 18 - 250mm model, bite the bullet and get the new lens.

One other issue that I experienced with the 18 - 250mm lens (that others have endorsed) is that it does not focus accurately at wide angle for short range shots - the workaround is to focus on a telephoto setting and then zoom out.

Since Adam says that the 18 - 135 Pentax lens is sharper, take his word for it.
The Tamron 18-270 lens is available rebranded under the Pentax name but at much higher price.
See Pentax smc Pentax-DA 18-270mm f/3.5-6.3 ED SDM Lens 21497 B&H

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