Sony Alpha DSLR-A100 Zoom Telephoto lenses that have a Sigma HSM focus motor

"Having the f2.8 throughout the range allows the pictures to be light without noise. It focuses super quick."

Fixed aperture The same aperture at all focal lengths

Wide aperture f/2.8

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

"Wow, Great lens from 120 to 400mm nice photos and pretty fast for under $1000.00 lens."

Great telephoto lens 400 mm

	Focus motor	Sigma HSM			Aperture	f/4.5
	Zoom range	3.3x			Length	204 mm
	Fixed aperture	No			Weight	1.7 kg
	Max focal length	400 mm			Image stabilization	Sigma OS

"This is a great value lens, and in my opinion can't be beat for the price. I photograph everything from wildlife to portraits to flowers and macro shots to landscapes. While this is not a do all lens, it fits right in and works for anything that fits within its 50-200mm zoom range. The build quality is also exceptional at the price, with no slop in the workings of the lens. It also comes with a lens hood that conveniently stores backwards on the lens. The focus is internal, so it good for polarized filters, tulip hoods, etc. All in all a great lens for the price."

Quite short 102 mm

	Focus motor	Sigma HSM			Aperture	f/4
	Zoom range	4x			Length	102 mm
	Fixed aperture	No			Weight	n/a
	Max focal length	200 mm			Image stabilization	Sigma OS

"I took it to Yellowstone on my first outing with it. I got some great shots of many aminals off in the distance."

Great telephoto lens 500 mm

	Focus motor	Sigma HSM			Aperture	f/5
	Zoom range	3.3x			Length	252 mm
	Fixed aperture	No			Weight	1.9 kg
	Max focal length	500 mm			Image stabilization	Sigma OS

"The telephoto capabilities of this lens are great and the wide-angle aspects at 18-24 area make this a multipurpose daily go everywhere lens."

Great zoom range 13.9x

	Focus motor	Sigma HSM			Aperture	f/3.5
	Zoom range	13.9x			Length	n/a
	Fixed aperture	No			Weight	0.6 kg
	Max focal length	250 mm			Image stabilization	Sigma OS