Excerpt: I bought this fisheye for fun, had a great time taking photos with a new perspective. The price is very reasonable. It is not the sharpest lens but very respectable. F stop of 3.5 is slow for inside a building or with movement.
Size wise, it is perfect for micro 43, does not add much weight at all.
Excerpt: With this lensi you can take photos at ISO 100 in extremely low light situation. It's only 3.5 aperture but with that wide opening it's enough for taking photos without extra support (just by hand) at so slow shutter speed than 1:2,5 without problems. Manual focus is not a problem either.
Summary: I love fisheye lenses; I own the 8mm Samyang fisheye for Canon EF-S mount and had great fun with it. This one is even better! Because it's so tiny, mounted on my Panasonic GX7, it's really easy to position it in interesting location.
Summary: I have the Rokinon version of this lens, another brand is Bower, all are actually made by Samyang. I also use it on a GX7 and I have to say I have a completely different experience than the one-star reviewer -- this lens is super-sharp and has become one of the favored lenses in my kit.
Excerpt: I'm very happy with this lens. (My first fisheye - micro four thirds mount.) Solid, inexpensive, and tiny. I find it complements my Olympus M.Zuiko 9-18mm quite well. De-fished, it can approximate a field of view well under 7mm, maybe even <5mm.
Summary: DO NOT BUY. I tested this lens on a GX7. After half an hour I decided to just return it. OK, maybe my particular Samyang fisheye lens was defective but I've no reason to think so. Center sharpness was OK (if not excellent), off-center (including not all that far off center) was poor to worse.