Four Thirds Zoom Lenses that have a f/4 or faster aperture

"I am delighted with this 140-600mm lense as it enables me to get close shots of birds and wildlife and has great clarity and sharpness for a moderately priced lense." bhphotovideo.com

Great telephoto lens 300 mm

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

"Instant focusing when used with e3. Great color retention." bhphotovideo.com

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

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

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

"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			Length	99 mm
	Fixed aperture	No			Diameter	80 mm
	Max focal length	60 mm			Weight	0.6 kg
	Zoom range	5x			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			Diameter	86 mm
	Max focal length	14 mm			Weight	0.8 kg
	Zoom range	2x			Min focal length	7 mm

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

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

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

"Love the clarity, love the 2.8. The wide angle gives me the ability to shoot a larger area closer and make the shots more interesting. For shooting groups of people it is wonderful." bhphotovideo.com

	Aperture	f/2.8			Length	93 mm
	Fixed aperture	No			Diameter	75 mm
	Max focal length	22 mm			Weight	485 g
	Zoom range	2x			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			Diameter	74 mm
	Max focal length	54 mm			Weight	440 g
	Zoom range	3.9x			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			Diameter	86 mm
	Max focal length	35 mm			Weight	0.9 kg
	Zoom range	2.5x			Min focal length	14 mm