Four Thirds Zoom Lenses that are 18mm or wider and have a f/4 or faster aperture

"I found the lens solid in feel, easy to change, quick enough focussing" bhphotovideo.com

	Aperture	f/4			Max focal length	18 mm
	Min focal length	9 mm			Diameter	79 mm
	Zoom range	2x			Length	74 mm
	Fixed aperture	No			Weight	275 g

"I am an avid amateur photographer and have found this lens to fill most of my needs. Although this lens is a bit heavy, the quality of craftmenship is very apparent. The image color quality is outstanding and it maintains detail out to the image margins even at 12mm. Good macro capability as well." bhphotovideo.com

	Aperture	f/2.8			Max focal length	60 mm
	Min focal length	12 mm			Diameter	80 mm
	Zoom range	5x			Length	99 mm
	Fixed aperture	No			Weight	0.6 kg

"Super sharp, wicked quality. Incredible for landscape photography!" bhphotovideo.com

Fixed aperture The same maximum aperture at all focal lengths

	Aperture	f/4			Max focal length	14 mm
	Min focal length	7 mm			Diameter	86 mm
	Zoom range	2x			Length	119 mm
	Fixed aperture	Yes			Weight	0.8 kg

"For routine use. the light weight, and compactness of the E-500/14-42 combo can be a real advantage." bhphotovideo.com

	Aperture	f/3.5			Max focal length	42 mm
	Min focal length	14 mm			Diameter	66 mm
	Zoom range	3x			Length	61 mm
	Fixed aperture	No			Weight	190 g

"This is the lens that will stay on my camera 90% of the time. Good all around lens." bhphotovideo.com

	Aperture	f/2.8			Max focal length	22 mm
	Min focal length	11 mm			Diameter	75 mm
	Zoom range	2x			Length	93 mm
	Fixed aperture	No			Weight	485 g

"Very sharp, fast and heavy. I use an SLR mostly to photograph flat art where I need a better tonal scale than smaller sensors." bhphotovideo.com

	Aperture	f/2.8			Max focal length	54 mm
	Min focal length	14 mm			Diameter	74 mm
	Zoom range	3.9x			Length	88 mm
	Fixed aperture	No			Weight	440 g

"All I can say is WOW! Terrific for night and low light shooting, ultra fast focusing, wonderful bokeh." bhphotovideo.com

Fixed aperture The same maximum aperture at all focal lengths

Wide aperture f/2

	Aperture	f/2			Max focal length	35 mm
	Min focal length	14 mm			Diameter	86 mm
	Zoom range	2.5x			Length	123 mm
	Fixed aperture	Yes			Weight	0.9 kg

"The lens is much better than the stock lens. It gives great depth of field when on the end of the lens and has a nice reach." bhphotovideo.com

Great zoom range 10x

Great telephoto lens 180 mm

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

"Fun lens for architecture/interior design photography and other cool compositions where you get plenty of light. " bhphotovideo.com

	Aperture	f/4			Max focal length	20 mm
	Min focal length	10 mm			Diameter	86 mm
	Zoom range	2x			Length	89 mm
	Fixed aperture	No			Weight	0.5 kg