Samsung GX-20 Lenses that have a Sigma HSM 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			Weight	0.5 kg
	Fisheye	No			Max focal length	50 mm
	Fixed aperture	n/a			Length	68 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			Weight	1.4 kg
	Fisheye	No			Max focal length	200 mm
	Fixed aperture	Yes			Length	184 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			Weight	0.8 kg
	Fisheye	No			Max focal length	150 mm
	Fixed aperture	Yes			Length	135 mm

"Great lens "portrait sharp" at 2.8 phenomenally sharp at f8 (equal if not better than 35ltd) great rendering. HSM is quiet and fast, build quality is great."

	Aperture	f/2.8			Image stabilization	None
	Focus motor	Sigma HSM			Weight	0.8 kg
	Fisheye	No			Max focal length	70 mm
	Fixed aperture	Yes			Length	95 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			Weight	0.5 kg
	Fisheye	No			Max focal length	70 mm
	Fixed aperture	No			Length	83 mm

"This is a solid lens. I'm not 100% convinced the OS in this lens is an improvement over the body image stabilization, but it seems to be roughly equivalent."

More advanced image stabilization Sigma OS

	Aperture	f/2.8			Image stabilization	Sigma OS
	Focus motor	Sigma HSM			Weight	395 g
	Fisheye	No			Max focal length	50 mm
	Fixed aperture	No			Length	n/a