John- I have the combo of a ZX-5n and a Sigma 28-135mm. I like this particular combo for everyday use... the lens covers most of the focal lengths I use most. I can't compare it to the Tamron, though as I've no experience w/ it. The lens feels "solid" and balances well w/ the ZX-5n. 4x6 prints w/ Fuji Superia Xtra 400 are very decent.
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