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Wide-angle weather-reistant lenses for Pentax?

Started Mar 1, 2017 | Questions thread
OP Sir Autofocus Regular Member • Posts: 225
And the winner is...
2

After testing the Sigma 10-20 4-5.6, Pentax 12-24, and Sigma 8-16, here's my ranking of how much I liked them.

3. Sigma 10-20 4-5.6. The cheapest of the bunch. It has purple fringing and other undesirable quality issues. Sigma also makes a 10-20 3.5 which I hear is better but I didn't test it. I would recommend avoiding the Sigma 10-20 4-5.6.

2. Pentax 12-24. In initial testing, it had noticeably better IQ than the Sigma 10-20. I found it for a little less money than the Sigma 8-16, and if someone wants a 12-24 zoom range then my impression is that this is a good choice.

1. My favorite of the group is the Sigma 8-16. It offers the widest zoom, and the IQ seems to be comparable to the Pentax 12-24 in my testing. I'll need to figure out how to deal with the distortion effects that happen at wide angles, but I'm told that this can be done with software. The lens colors and sharpness look good to my eye. I found my copy for slightly more money than the Pentax 12-24, but the wide-angle zoom advantage is so significant that I think it's money well spent.

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