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Thread: Sigma 10-20mm ex dc hsm f3.5 vs 4-5.6

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    Sigma 10-20mm ex dc hsm f3.5 vs 4-5.6

    I'm going to take the plunge and get a Sigma 10-20mm for my Pentax. I notice there are 2 types in the EX DC HSM range, the f3.5, and the f4-5.6, besides the obvious faster speed, can anyone tell me why I should pay the extra for the f3.5?? Better image quality???
    Pentax K20D - Sigma 10-20mmf3.5 - Sigma 18-55mm & 50 - 200mm kits - Pentax A Series 50mm f1.7 - Hoya CPL Filter & Hoya ND8 Filter & Dodgy tripod that does the trick for now!
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    Quote Originally Posted by Gav1n View Post
    I'm going to take the plunge and get a Sigma 10-20mm for my Pentax. I notice there are 2 types in the EX DC HSM range, the f3.5, and the f4-5.6, besides the obvious faster speed, can anyone tell me why I should pay the extra for the f3.5?? Better image quality???
    I have the 3.5 version

    It feels better built...

    It has a larger diameter threat.

    Not sure if it really justifies the $$$$ but, It felt more comfortable.

    Scotty
    Canon 7D : Canon EF 70-200mm f:2.8 L IS II USM - Canon EF 24-105 f:4 L IS USM - Canon EF 50mm f:1.8 - Canon EF-s 18-55mm f:3.5-5.6
    Sigma APO 150-500mm f:5-6.3 DG OS HSM
    - Sigma 10-20mm f:3.5 EX DC HSM
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    They took a great lens & well changed it - but why and they keep selling the older version. If it was optically better then maybe, I recently bought the older version as I could not justify extra dollars.

    I think the jury is still out.
    Regards
    Kevin

    Pentax K3, Pentax Tamron Sigma short glass
    Nikon D500. nikkor 200-500 f5.6.

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    I have seen a few reviewers claim the older slower 4-5.6 version is optically better at 10mm, beyond that they are pretty much the same.. I guess if you don't need the constant 3.5 it may be worth saving the money and getting the older version..

    BTW.. I was always very happy with the 10-20mm f4-5.6 when I had it in Pentax mount..

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