Samsung GX-20 Lenses that have a focus motor and have a f/2.8 or faster aperture

"I have been very satisfied: this lens is absolutely great for low light, or portraiture, requiring large apertures. I shoot with a Pentax k-x, non full-frame, and so the focal length is closer to 85 mm, perfect for portraits."

Wide aperture f/1.4

	Aperture	f/1.4			Image stabilization	None
	Focus motor	Sigma HSM			Min focal length	50 mm
	Fisheye	No			Max focal length	50 mm
	Fixed aperture	n/a			Length	68 mm

"The build quality seems top notch, no play in the focus or zoom rings at all, and very smooth action of both."

	Aperture	f/2.8			Image stabilization	None
	Focus motor	Pentax SDM			Min focal length	50 mm
	Fisheye	No			Max focal length	135 mm
	Fixed aperture	Yes			Length	136 mm

"I purchased this product to shoot soccer photos and as a replacement for a 70-300mm f4.5-5.6 lens in order to shoot "under the lights". I have not been dissappointed."

	Aperture	f/2.8			Image stabilization	None
	Focus motor	Sigma HSM			Min focal length	70 mm
	Fisheye	No			Max focal length	200 mm
	Fixed aperture	Yes			Length	184 mm

"Extremely well built, weather sealed, fast, and sharp at all F-stops."

	Aperture	f/2.8			Image stabilization	None
	Focus motor	Pentax SDM			Min focal length	200 mm
	Fisheye	No			Max focal length	200 mm
	Fixed aperture	n/a			Length	134 mm

"Well built, nicely damped MF, fast accurate AF, acceptably sharp wide open, even better at F/4, and really pleasing bokeh."

	Aperture	f/2.8			Image stabilization	None
	Focus motor	Sigma HSM			Min focal length	50 mm
	Fisheye	No			Max focal length	150 mm
	Fixed aperture	Yes			Length	135 mm

"This is a great all aroud lens. Love the wide angle I get and just enough zoom for an alround."

More advanced image stabilization Sigma OS

	Aperture	f/2.8			Image stabilization	Sigma OS
	Focus motor	Sigma HSM			Min focal length	17 mm
	Fisheye	No			Max focal length	70 mm
	Fixed aperture	No			Length	83 mm

"I love the lens in almost all ways. It's sharp, fast focusing, needs very little light in F1.4 and the quick shift to manual focus is really OK to have."

Wide aperture f/1.4

	Aperture	f/1.4			Image stabilization	None
	Focus motor	Pentax SDM			Min focal length	55 mm
	Fisheye	No			Max focal length	55 mm
	Fixed aperture	n/a			Length	n/a