Sigma Wildlife lenses for less than $500 that have a generic focus motor, have a 100mm or longer focal length and have a f/4 or faster aperture

"The macro is incredible for flowers, butterflies, pretty much anything you would want to get 1:2." bhphotovideo.com

	Max focal length	300 mm			Image stabilization	None
	Aperture	f/4			Length	119 mm
	Focus motor	Generic motor			Weight	0.6 kg
	Auto focus	Yes			Diameter	76 mm

"This inexpensive zoom is solidly built, operates smoothly and has minimal chromatic aberration (purple fringing'). Very useful outdoors and for general telefoto purposes. I expected softness at the end of the zoom range but was pleasantly surprised (!). Allows me to find interesting faces in a crowd and capture fine details of remote objects (e.g. when filming architectural curiosities). Not too heavy and, when attached to a A700, balances well. The lens does not creep and requires just the right amount of force in changing the focal length" bhphotovideo.com

	Max focal length	300 mm			Image stabilization	None
	Aperture	f/4			Length	120 mm
	Focus motor	Generic motor			Weight	0.5 kg
	Auto focus	Yes			Diameter	77 mm

"Even though the info says it's only for Sigma camera's, it works very well on my Nikon D90." bhphotovideo.com

	Max focal length	300 mm			Image stabilization	None
	Aperture	f/4			Length	120 mm
	Focus motor	Generic motor			Weight	0.5 kg
	Auto focus	Yes			Diameter	77 mm

"Great range, compact size, good operation, sound construction." bhphotovideo.com

	Max focal length	300 mm			Image stabilization	None
	Aperture	f/4			Length	120 mm
	Focus motor	Generic motor			Weight	0.5 kg
	Auto focus	Yes			Diameter	76 mm

"I am very satisfied with it already. Good sharp photos, good zooming range." bhphotovideo.com

	Max focal length	300 mm			Image stabilization	None
	Aperture	f/4			Length	120 mm
	Focus motor	Generic motor			Weight	0.5 kg
	Auto focus	Yes			Diameter	76 mm

"It has good build quality. The OS feature definitely works, and gives you a couple of stops at least. I'm satisfied with the sharpness and colors of the pictures I have taken." bhphotovideo.com

More advanced image stabilization Sigma OS

	Max focal length	300 mm			Image stabilization	Sigma OS
	Aperture	f/4			Length	127 mm
	Focus motor	Generic motor			Weight	0.6 kg
	Auto focus	Yes			Diameter	77 mm