Wide Angle Lens For Canon Slr Camera

Mandy asks…What Canon wide angle lens with an aperture of 2.8 would be best for a full frame sensor slr?I own a Canon 5D Mark I and am in desperate need of a wide angle lens. I was unaware the certain lenses do not work with full frame sensors. I bought a Sigma 30mm 1.4 and noticed vignetting when I used it with my 5D, and do not want this to happen with the next lens I purchase.mr.eos answers:Based upon decades of shooting 35 mm cameras, I would suggest in this order, a wide angle lens for

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