Product
Lumix G 20mm f/1.7 II Asph is a auto focus wide angle lens for 4/3 cameras.
Optical design
Has 7 aperture blades, mid-grade lenses usually have this amount of blades. Having rounded blades provides out of focus circle shape closer to a circle. Wide open, subjects located outside the depth of field are shown very blurred.
Physical characteristics
25 mm long, this small lens should be always in the camera bag. Weights 87 grams so convinient to carry. With a lens filter diameter of 46 mm you are one step from the next standard filter size, buy step-up ring and bigger filter but you can chose from plenty options.
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