Wide angle lenses for less than $400 that are 10mm or wider and have a f/4 or faster aperture

"It is extremely sharp and is definatly wide enough. This is a true wide angle lens." bhphotovideo.com

Supports autofocus Easier to use

Fixed aperture The same maximum aperture at all focal lengths

	Aperture	f/3.5			Diameter	86 mm
	Min focal length	10 mm			Length	89 mm
	Auto focus	Yes			Zoom range	2x
	Fixed aperture	Yes			Weight	0.5 kg

"When you really need to get it all in view, this is a great lens. Well made lens for the money. No chromatic aborations! Sharp if you use f11-16. Construction is excellent. Nothing negative to say about this lens." bhphotovideo.com

Supports autofocus Easier to use

	Aperture	f/4			Diameter	86 mm
	Min focal length	10 mm			Length	89 mm
	Auto focus	Yes			Zoom range	2x
	Fixed aperture	No			Weight	0.5 kg

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

Supports autofocus Easier to use

Fixed aperture The same maximum aperture at all focal lengths

	Aperture	f/3.5			Diameter	86 mm
	Min focal length	10 mm			Length	89 mm
	Auto focus	Yes			Zoom range	2x
	Fixed aperture	Yes			Weight	0.5 kg

"I have yet to really put this lens through its paces, but so far I am very satisfied." bhphotovideo.com

Supports autofocus Easier to use

Fixed aperture The same maximum aperture at all focal lengths

	Aperture	f/3.5			Diameter	86 mm
	Min focal length	10 mm			Length	89 mm
	Auto focus	Yes			Zoom range	2x
	Fixed aperture	Yes			Weight	0.5 kg