When I discovered how compact and cheap the original 14-42mm lenses were, I bought one to use on my GF2. I was dismayed, however, to discover the goofy 40,5mm filter threads and the fact that no one, including Oly, made a hood for the lens. For reasons that are off-topic to this post, I am a lens hood believer. Solution: I spent three bucks with "Digital Goja" on eBay and bought a 40.5mm to 52mm step-up ring. 52mm is the filter size for my 9-18mm, the main lens for the GF2. I then pawed through the used/junk box at my local camera shop and bought two Nikon hoods. (Almost all the old film Nikon lenses up through the 200/f4 were 52mm.) The 35/2.8 hood threaded on nicely and produced no vignetting even when used on top of a skylight filter. I also bought a 50/f2 shade because, unlike the first one, it is a snap-in style. It vignetted badly, of course, so I tried cutting it down in my lathe. That worked to a point, but I discovered that the snap-in spring ring itself is actually wide enough to produce very slight vignetting on its own. So not a totally successful experiment. I will still use this cut-down hood, though, because of its handy ability to be reversed on the lens and used with a 53mm Nikon snap-in cap. I'll just have to remember that I need to be stopped down or zoomed slightly to avoid having to correct the vignetting in post. I always wondered why the wide-angle Nikon hoods were screw-in rather than snap. Now I know. I hope this helps someone. I searched the forums in vain for a solution to this problem. This is a pretty decent one IMHO.