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Master
1,177 Answers
- Posted on Nov 17, 2010
Re: My sigma 105 lens do not go to f2.8. it reaches only...
If this is the Sigma 28-105mm f/2.8-4.0 as in the title, then the maximum aperture will vary with the focal length. It is probably only 2.8 when the focal length is zoomed to 28mm. It will be 4 at 105mm, and at focal lengths in between it will be in between.
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