Nikon D3100 Zoom Lenses that have a f/2.8 or faster aperture

"I bought this lens to fill the gap between my 14-24 and 70-200 and have not been disappointed. It is as every bit as good as the other two professional products." bhphotovideo.com

	Aperture	f/2.8			Length	132 mm
	Focus motor	Nikon AF-S			Max focal length	70 mm
	Image stabilization	None			Zoom range	2.9x
	Fixed aperture	Yes			Weight	0.9 kg

"Amazing very nice lens." bhphotovideo.com

More advanced image stabilization Sigma OS

	Aperture	f/2.8			Length	91 mm
	Focus motor	Sigma HSM			Max focal length	50 mm
	Image stabilization	Sigma OS			Zoom range	2.9x
	Fixed aperture	Yes			Weight	0.6 kg

"This lens is many things. It is pretty sharp, amazingly so above f/4. It is durable, it is reliable it is fast. It is a great deal." bhphotovideo.com

Great telephoto lens 200 mm

	Aperture	f/2.8			Length	188 mm
	Focus motor	None			Max focal length	200 mm
	Image stabilization	None			Zoom range	2.5x
	Fixed aperture	Yes			Weight	1.3 kg

"I purchased this lens as an upgrade when i purchased my D90. I have not been disappointed. From weddings to flowers to portraits to everything else, this lens has proven itself a sweet performer everytime. The sharpness is outstanding, the bokeh is amazing,and the overall image qaulity is incredible." bhphotovideo.com

	Aperture	f/2.8			Length	81 mm
	Focus motor	None			Max focal length	85 mm
	Image stabilization	None			Zoom range	3.5x
	Fixed aperture	No			Weight	0.5 kg

"The colors this lens can capture are outstanding!" bhphotovideo.com

	Aperture	f/2.8			Length	132 mm
	Focus motor	Nikon AF-S			Max focal length	24 mm
	Image stabilization	None			Zoom range	1.7x
	Fixed aperture	Yes			Weight	1 kg

"The build quality is very good, focus and zoom ring are nicely damped and operate smoothly. You do not experiance any wobbling and the lens features the well known EX finish." bhphotovideo.com

	Aperture	f/2.8			Length	94 mm
	Focus motor	Sigma HSM			Max focal length	70 mm
	Image stabilization	None			Zoom range	2.9x
	Fixed aperture	Yes			Weight	0.8 kg