A great lens that I've lightly used over a couple years. Originally paid $400. Like new.

Here is a description for a new one ($399) from Henry's (https://www.henrys.com/panasonic-lumix-g-20mm-1-7-lens/5637228784.p?color=Black&size=M-4/3&style=New):

Ultra-portable Pancake Lens
Circular Aperture Diaphragm
Contrast AF System Support
Filter Diameter: 46mm
F1.7 brightness fixed focal length lens produces bright photos with dramatic soft focus
Two aspherical lenses for superb optical performance
Multiple lens coating minimizes ghosts and flare
Durable metal mount
Features a dramatic compactness and light weight despite its F1.7 brightness allowing a beautiful soft focus for photos to be even more impressive
Comprised of seven lenses in five groups, the lens system uses two aspherical lenses most effectively to minimize both distortion and chromatic aberrations, achieving super high resolution corner to corner
The versatile 20 mm of focal distance (Equivalent to 40 mm on a 35 mm film camera) is suitable for wide variety of occasions from daily snapshots including scenery like sunsets and dimly lit indoor shots to the deliberately creative shots taking advantage of its beautiful soft focus
When mounted on the LUMIX G Micro System Cameras, the LUMIX G 20 mm / F1.7 ASPH allows use of the advanced contrast AF system, which includes a Face Recognition function, for more convenient, more enjoyable shooting
Seven blades give the aperture a rounded shape that produces an attractively smooth effect in out-of-focus areas when shooting at larger aperture settings
The LUMIX G 20 mm / F1.7 ASPH lens also features a highly reliable metal mount, and uses multi-coated lens elements that minimize ghosts and flare to further enhance its optical performance
The LUMIX G 20mm / F1.7 ASPH. utilizes a lens drive system to realize a compact and bright F1.7 lens
As a result, sound and vibration may occur during focus operation, but this is not a malfunction
Operating sounds will be recorded when auto focus is performed during motion image recording
It is recommended to record with Continuous AF set to OFF, if the sound of operation bothers you. Also, it is not possible to set the focus mode to AFC
Continuous AF does not work for still image recording
Specifications:
Lens Construction: 7 elements in 5 groups (2 Aspherical lenses)
Mount: Micro Four Thirds mount
Optical Image Stabilizer: No
Focal Length: f=20mm (35mm camera equivalent 40mm)
Aperture Type: 7 diaphragm blades / Circular aperture diaphragm
Aperture: F1.7
Minimum Aperture: F16
Closest Focusing Distance: 20 cm / 7.87 in
Maximum Magnification: Approx. 0.13x / 0.25x (35mm camera equivalent)
Diagonal Angle of View: 57 degrees
Filter Diameter: 46mm
Dimensions (DxL): 63 x 25.5 mm / 2.48 x 1.00 in
Recommended Humidity: 40%RH to 60%RH
Weight: 100.07 g / 3.53 oz
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