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09-26-2011, 07:29 AM   #1
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Tamron and Sigma Lenses

I want to buy some Tamron and Sigma lenses. But I want them to be fullframe compatible, just in case Pentax comes out a full frame in 4 years. What am I looking for, like DG lenses for Sigma? I went to Sigma's website. They said that DT is for both full and aps-c frame. But when I look into some of the details of the lenses, they only menti
on full frame and not aps-c.

09-26-2011, 07:51 AM   #2
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if a lense is FF so it is APS-C too, because APS-C is smaller then FF
09-26-2011, 09:56 AM   #3
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Any full-frame lens in a PK mount will work any APS-C Pentax dSLR.

But lenses designed for APS-C (crop-sensor) dSLRs may not work right on a full-frame camera, especially shorter lenses which vignette.

Yes, a full-frame PK lens will take you anywhere!
09-26-2011, 10:31 AM   #4
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I have the Tamron 28-75 f2.8 and Tamron 90mm f2.8 macro lenses (for Nikon). I can recommend them both. They both work on full frame as well as APS-C cameras, and they are both very sharp lenses...albeit 28-75mm is an awkward length for an crop sensor camera and better suited to a full frame one. You'll have an upside I don't have if you use them on a Pentax....Shake Reduction!

09-26-2011, 11:49 AM   #5
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simply buy the last analogue lenses, that were designed for 35mm-films. ok, sometimes, they are slightly heavier because of more glass and sometimes more quality, but mostly they are even cheaper in comparison to the aps-c-pendants

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