Four Thirds Zoom Lenses that have a 100mm or longer focal length and have a f/4 or faster aperture

"Amazing performance from this lens." bhphotovideo.com

	Aperture	f/4			Length	127 mm
	Max focal length	300 mm			Zoom range	4.3x
	Fixed aperture	No			Diameter	80 mm
	Weight	0.6 kg			Min focal length	70 mm

"Excellent lens for sport and fast action. The external zooming makes it a bit fragile if you're shooting in crowds or potentially damaging environments." bhphotovideo.com

	Aperture	f/2.8			Length	157 mm
	Max focal length	200 mm			Zoom range	4x
	Fixed aperture	No			Diameter	87 mm
	Weight	1 kg			Min focal length	50 mm

"Light weight and easy to handle. Imagages are very sharp and bright." bhphotovideo.com

Quite short 72 mm

Small diameter 66 mm

Very light 220 g

	Aperture	f/4			Length	72 mm
	Max focal length	150 mm			Zoom range	3.8x
	Fixed aperture	No			Diameter	66 mm
	Weight	220 g			Min focal length	40 mm

"One of the major benefits to the lens is that we have no need to switch cameras, or lens because it comes in to 18mm but zooms out to 180mm." bhphotovideo.com

Great zoom range 10x

Quite short 85 mm

	Aperture	f/3.5			Length	85 mm
	Max focal length	180 mm			Zoom range	10x
	Fixed aperture	No			Diameter	78 mm
	Weight	435 g			Min focal length	18 mm

"Top notch lens without any real weakness, great for portraiture, landscapes, sports and more. Very Sharp, exceptional full-metal build." bhphotovideo.com

Fixed aperture The same maximum aperture at all focal lengths

Wide aperture f/2

	Aperture	f/2			Length	214 mm
	Max focal length	100 mm			Zoom range	2.9x
	Fixed aperture	Yes			Diameter	97 mm
	Weight	1.7 kg			Min focal length	35 mm

"It was perfect for several graduations. I generally use it with my E3 body, which makes the whole system very weather resistant." bhphotovideo.com

Fixed aperture The same maximum aperture at all focal lengths

	Aperture	f/2.8			Length	277 mm
	Max focal length	250 mm			Zoom range	2.8x
	Fixed aperture	Yes			Diameter	125 mm
	Weight	3.3 kg			Min focal length	90 mm