Sony Alpha DT Portrait lenses made by Sigma that have a f/2.8 or faster aperture

"The lens feels very solid and well made."

Fixed aperture The same aperture at all focal lengths

More advanced image stabilization Sigma OS

	Aperture	f/2.8			Weight	0.6 kg
	Fixed aperture	Yes			Max focal length	50 mm
	Image stabilization	Sigma OS			Zoom range	2.9x
	Focus motor	Sigma HSM			Min focal length	17 mm

"This is a very functional lens in low light situations when using a monopod. I used it for a show inside of an event center with a lot of success (if you are looking for motion blur in your action shots). Overall I really like the lens and would recommend it."

More advanced image stabilization Sigma OS

	Aperture	f/2.8			Weight	395 g
	Fixed aperture	No			Max focal length	50 mm
	Image stabilization	Sigma OS			Zoom range	2.8x
	Focus motor	Sigma HSM			Min focal length	18 mm

"I just returned from a trip to San Francisco and was very satisfied with the performance of the lens. It worked well for street shots in Chinatown as well as wide angles at the Golden Gate bridge."

Fixed aperture The same aperture at all focal lengths

	Aperture	f/2.8			Weight	450 g
	Fixed aperture	Yes			Max focal length	50 mm
	Image stabilization	None			Zoom range	2.8x
	Focus motor	None			Min focal length	18 mm

"Lens is incredible: well built, great OS, great clarity, silent and fast auto focus."

	Aperture	f/2.8			Weight	455 g
	Fixed aperture	No			Max focal length	70 mm
	Image stabilization	None			Zoom range	4.1x
	Focus motor	None			Min focal length	17 mm