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

"Quick and quiet autofocus. Tack sharp at 5.6. Also extremely sharp at 2.8."

Fixed aperture The same aperture at all focal lengths

Wide aperture f/2.8

	Focus motor	Sigma HSM			Length	184 mm
	Fixed aperture	Yes			Image stabilization	None
	Aperture	f/2.8			Weight	1.4 kg
	Max focal length	200 mm			Min focal length	70 mm

"Its well balanced. Overall nice glass!"

Great telephoto lens 400 mm

	Focus motor	Sigma HSM			Length	204 mm
	Fixed aperture	No			Image stabilization	Sigma OS
	Aperture	f/4.5			Weight	1.7 kg
	Max focal length	400 mm			Min focal length	120 mm

"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			Length	102 mm
	Fixed aperture	No			Image stabilization	Sigma OS
	Aperture	f/4			Weight	n/a
	Max focal length	200 mm			Min focal length	50 mm

"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			Length	252 mm
	Fixed aperture	No			Image stabilization	Sigma OS
	Aperture	f/5			Weight	1.9 kg
	Max focal length	500 mm			Min focal length	150 mm