Canon Rebel T3i Lenses for Canon EF-S lens mount that have a Sigma HSM focus motor

"One of the main pros of these lens is the AF system – fast and acurate."

Fixed aperture The same aperture at all focal lengths

	Focus motor	Sigma HSM			Aperture	f/2.8
	Fisheye	No			Zoom range	2.9x
	Fixed aperture	Yes			Max focal length	50 mm
	Image stabilization	Sigma OS			Length	n/a

"I love that a lens in this price-range will go to f/1.4 - it provides great bokeh and is very good for indoors in low light. Pictures in churches and museums have turned out especially well."

Wide aperture f/1.4

	Focus motor	Sigma HSM			Aperture	f/1.4
	Fisheye	No			Zoom range	1x
	Fixed aperture	n/a			Max focal length	30 mm
	Image stabilization	None			Length	59 mm

"I have been shooting sport photos for a while now and was looking for something new to spice up the images. I wasn't sure how I could use the fisheye but now I have had a chance to use it... wow. I can get some excellent images from a perspective I have never used before. I love this lens."

Fisheye Extremely wide circular images

	Focus motor	Sigma HSM			Aperture	f/2.8
	Fisheye	Yes			Zoom range	1x
	Fixed aperture	n/a			Max focal length	4.5 mm
	Image stabilization	None			Length	78 mm

"I use this for primarily bmx photos. It has great colors and is very sharp. Good distortion and fast focusing!"

Fisheye Extremely wide circular images

	Focus motor	Sigma HSM			Aperture	f/2.8
	Fisheye	Yes			Zoom range	1x
	Fixed aperture	n/a			Max focal length	10 mm
	Image stabilization	None			Length	83 mm

"The lens is great, especially If you like taking interior shots or panoramic, architectural buildings, architectural models."

Fixed aperture The same aperture at all focal lengths

	Focus motor	Sigma HSM			Aperture	f/3.5
	Fisheye	No			Zoom range	2x
	Fixed aperture	Yes			Max focal length	20 mm
	Image stabilization	None			Length	n/a

"Very bright optics, fast auto focus, beautiful soft bokeh, built like a tank, and a great low light lens."

	Focus motor	Sigma HSM			Aperture	f/2.8
	Fisheye	No			Zoom range	2.8x
	Fixed aperture	No			Max focal length	50 mm
	Image stabilization	Sigma OS			Length	n/a

"Great for certain things such as landscape, real-estate, and architecture."

	Focus motor	Sigma HSM			Aperture	f/4.5
	Fisheye	No			Zoom range	2x
	Fixed aperture	No			Max focal length	16 mm
	Image stabilization	None			Length	n/a

"Great for close ups of action (sports), wildlife and portraits."

	Focus motor	Sigma HSM			Aperture	f/4
	Fisheye	No			Zoom range	4x
	Fixed aperture	No			Max focal length	200 mm
	Image stabilization	Sigma OS			Length	102 mm

"I got this lens about a month and a half ago and I have been pleased with it so far. It is my second walk-around lens for my Canon XTi."

	Focus motor	Sigma HSM			Aperture	f/3.8
	Fisheye	No			Zoom range	6.9x
	Fixed aperture	No			Max focal length	125 mm
	Image stabilization	Sigma OS			Length	89 mm

"Great lens which work very well within the Sea & Sea Standard Flat Port with no vignetting."

	Focus motor	Sigma HSM			Aperture	f/4
	Fisheye	No			Zoom range	2x
	Fixed aperture	No			Max focal length	20 mm
	Image stabilization	None			Length	81 mm