Question about Sigma 12-24 lens

Started Jan 27, 2014 | Questions thread
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aruk5
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Question about Sigma 12-24 lens
Jan 27, 2014

I am thinking about buying this lens but confused over the different variants of this lens sold in the market. I am planning on going in for the Canon or Pentax version. Some copies of this lens seems to have a manual aperture control wheel in the rear while some dont seem to have them.

I have the following queries:-

1.Are all versions of this lens Full frame or only some? Incase they are how do I find out?

2.If there is an aperture control wheel on the rear is it an old or new version of this lens? Which one is sharper at wide apertures?

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