Summary: I was a little nervous ordering this but for the price I was willing to try it. I almost never take my 20mm 1.7 off my G5, but there are times I'd like a wider shot. While it didn't specifically say it would work on the 20mm, it screwed on without a problem.
Summary: I bought this for the Panasonic GX7, it's not made for the kit lens. But it kind of fits, so I kept it. The fisheye look can only be used in the smallest mm at 14mm on the kit lens. All other mm's on the lens make it a wide lens.
Summary: This Conversion lens (along with the Wide, Telephoto and Macro) allows me to carry extra capability in a small and lightweight package. It is not as "fishy" as some fisheyes, but it does do a remarkably good job of making my 12 2.5 and 14-42 GX lenses much wider.
Summary: This is a nice addition to the 14mm lens. Since I put it on, I have used the two as one, almost exclusively. It is, in fact, mostly a wide angle lens with some distortion at the edges, giving it a fisheye effect. But it is not a fisheye.
Summary: If you want to get a wide angle for your GH2 or micro 4/3 camera this this is a cheap alternative if you already own the 14mm pancake lens. There is some distortion in the 4 corners when taking pics. However In video mode (16:9) the distortion disappears and the lens is very sharp.
panasonic DMW-GFC1GU Fisheye Converter for H-PS14042 + H-H014
R. J. Mcelheran, Amazon
21 June 2014
Summary: As I already had the Panasonic 14mm pancake lens and wanted a fisheye type lens to take on holiday a lot lighter than my Russian Peleng lens/cosh - and I had been favourably impressed by the straight wide angle converter for the 14mm - I decided to give this one a go.