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

"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			Min focal length	50 mm
	Focus motor	Pentax SDM			Max focal length	135 mm
	Image stabilization	None			Zoom range	2.7x
	Weight	0.7 kg			Length	136 mm

"I use the lens for landscape and wildlife photography. Love the fast quiet autofocus and very sharp image quality."

	Aperture	f/2.8			Min focal length	70 mm
	Focus motor	Sigma HSM			Max focal length	200 mm
	Image stabilization	None			Zoom range	2.9x
	Weight	1.4 kg			Length	184 mm

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

	Aperture	f/2.8			Min focal length	200 mm
	Focus motor	Pentax SDM			Max focal length	200 mm
	Image stabilization	None			Zoom range	1x
	Weight	0.8 kg			Length	134 mm

"I have had this lens for a few months now and it has become my favorite and most used lens. It has very quiet focusing and beautiful color production."

	Aperture	f/2.8			Min focal length	50 mm
	Focus motor	Sigma HSM			Max focal length	150 mm
	Image stabilization	None			Zoom range	3x
	Weight	0.8 kg			Length	135 mm