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: This is an exceptional lens. Don't let the price tag fool you. Some of my favorite shots have been taken with this lens. Just take your time during composition and mind your toes and knuckles.
Excerpt: I have been using fisheye lenses for over 10 years, starting with a 16mm full-frame one for film Nikons. I have taken thousands of shots with a 10.5mm Nikon DX fisheye lens, and added this lens as my 3rd MFT lens. So far I have used it for landscapes and architectural shots.
Excerpt: I've been using this lens for about 6 months now, first on an Olympus E-PM1 and later on an E-M5. I can't say a bad thing about it! I love the super wide field of view. I love the feel of the focus ring and the aperture ring. Best of all, this lens is sharp!
Pros: Durable, Easy To Use, Fun, Lightweight, Reliable, Sharp, Versatile
Summary: I just want to point out that this lens is sold under at least three different brand names: Samyang, Bower , and Rokinon . (The other reviewer mentioned ProOptic, but I didn't find that in an Amazon search, so I guess it's no longer sold under that name.