Four Thirds Zoom Wide angle lenses that 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			Length	74 mm
	Fixed aperture	No			Weight	275 g
	Zoom range	2x			Max focal length	18 mm
	Diameter	79 mm			Min focal length	9 mm

"The SWD focussing is quite exceptional (as is the macro capability). If you have only one ZD lens make it this one." bhphotovideo.com

Great zoom range 5x

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

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

Fixed aperture The same maximum aperture at all focal lengths

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

"It's very light (not aluminum like the 70s) but the depth of field is surprisingly minimal for a lens of this size" bhphotovideo.com

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

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

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

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

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

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

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