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Best affordable ultra-wide to wide angle lens for a Canon EF mount?

I'm looking into buying my first wide angle lens. Unfortunately some are quite expensive and out of my price range. I have a Canon 40D, and need a lens to fit on an EF mount, preferably with an aperture of <2.8. I was looking at the 20mm f2.8 USM,


First, and most important question... what is your budget for this lens?

Ultrawide angle would be something like the Canon 10-22 EF-S or the Tamron 10-24. If you want ultrawide angle and f/2.8, prepare to pay for it. Tokina has a 16-50

Canon EF 20mm f/2.8 USM Wide Angle Lens for Canon SLR Cameras + ...

www.amazon.com Wide-angle lenses let you capture more of the image by broadening the angle of view and increasing the depth of field, thereby ...

Canon EF 20mm f/2.8 USM Wide Angle Lens for Canon SLR Cameras

Canon EF 20mm f/2.8 USM Wide Angle Lens for Canon SLR Cameras More details &amp; Discount link: www.amazon.com

Canon EF 24mm f/2.8-Focus speed and sound

even though focusing speed is not as fast as lens which has USM, the focusing speed is fast enough.

Aquadom & Sea life centre, Berlin

EOS 500D and various lenses: Canon EF-S 10-22mm f/3.5-4.5 USM - Canon EF 20mm f/2.8 USM - Canon EF 50mm f/1.4 USM - BabyLens kit High quality HD ...

Rival Summers - If You Only Knew

www.facebook.com www.jessespeelman.com shot with Canon T2i w/Canon 20mm f2.8USM Canon 5D Mark II w/Canon 50mm f1.4 USM Rode Videomic Magic Lantern ...