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Question about Sigma 12-24 lens

Started Jan 27, 2014 | Questions thread
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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?

This question has not been answered yet.
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