Canon EF Lenses for less than $900 that are 18mm or wider and have a f/2.8 or faster aperture

"I like the lense. It is a great walk around lense which is light and fast enough for situations where other lenses fail. I used to have the 17-85mm EF-S Canon lense before and was looking for a faster alternative that is having a good wide ancle" bhphotovideo.com

More advanced image stabilization Sigma OS

Great zoom range 4.1x

Supports autofocus Easier to use

	Min focal length	17 mm			Image stabilization	Sigma OS
	Aperture	f/2.8			Fixed aperture	No
	Fisheye	No			Zoom range	4.1x
	Auto focus	Yes			Diameter	79 mm

"The zoom is smooth once you get the handle of it, and its low light capability is excellent considering the price." bhphotovideo.com

More advanced image stabilization Sigma OS

Supports autofocus Easier to use

	Min focal length	17 mm			Image stabilization	Sigma OS
	Aperture	f/2.8			Fixed aperture	Yes
	Fisheye	No			Zoom range	2.9x
	Auto focus	Yes			Diameter	84 mm

"Coupled with a full frame body like the 5DMII this is an excellent lens for architecture, interior or any form of landscape photography." bhphotovideo.com

Supports autofocus Easier to use

	Min focal length	16 mm			Image stabilization	None
	Aperture	f/2.8			Fixed aperture	Yes
	Fisheye	No			Zoom range	2.2x
	Auto focus	Yes			Diameter	89 mm

"Light, Solid (metal build), superb IQ, sharp, good color balance, gives dramatic scenes. Nice close focusing." bhphotovideo.com

Fisheye Extremely wide circular images

Supports autofocus Easier to use

	Min focal length	15 mm			Image stabilization	None
	Aperture	f/2.8			Fixed aperture	n/a
	Fisheye	Yes			Zoom range	1x
	Auto focus	Yes			Diameter	74 mm

"very good lens. the best walk around for a crop." bhphotovideo.com

More advanced image stabilization Canon IS

Supports autofocus Easier to use

	Min focal length	17 mm			Image stabilization	Canon IS
	Aperture	f/2.8			Fixed aperture	Yes
	Fisheye	No			Zoom range	3.2x
	Auto focus	Yes			Diameter	84 mm