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F2.8 and light with Canon 17-55 and Sigma 18-35

Started Aug 18, 2015 | Discussions thread
Lemming51
Lemming51 Forum Pro • Posts: 15,278
Re: F2.8 and light with Canon 17-55 and Sigma 18-35

J A C S wrote:

My guess would be the Sigma because it would vignette less at f/2.8. I do not think that the difference would be small.

yep, I think you're right.  At 17-18mm the T-stop difference might be 1/3 stop at center to about 1 stop at the corners.  Not so much at 35mm.

http://www.the-digital-picture.com/Reviews/Lens-Vignetting-Test-Results.aspx?Lens=398&Camera=452&FLI=0&API=0&LensComp=854&CameraComp=736&FLIComp=0&APIComp=2

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