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I have the Sigma 17-70 and love it. I opted for it over the 18-55 kit lens. I hasn't disappointed me. However for travel, I've chosen to add the Pentax 18-250. IQ might not be perfect at all lengths, but overall it will be a great lens to accompany my Sigma 10-20 when I'm traveling. If the Pentax version of the 17-70 had been available I would have looked very closely at it for sure.
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Ror
K10D | DA 18-250 | Sigma 10-20/17-70 | Spotmatic II | SMC Tak M42-28/50/135
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