My first copy of this lens was stolen, so I bought another s/h from Wex. It's a fun item, small and light enough to keep in the bag for any occasion, but seriously sharp. The clip-on lens cap is much better than the Canon version.

Lightweight; Sharp Focus

This lens is amazing value for money. The results are sharp and the distortion not too extreme. I had previously tried the Vivitar equivalent and had been very disappointed, but this lens is in the same league as Canon's own. Not being auto focus isn't and issue as the depth of field is enormous.

Samyang’s fisheye is the cheapest lens here , and it’s perfect for getting creative on your travels. The 12mm equivalent focal length produces a whopping 180° diagonal field-of-view on a cropped mirrorless sensor, and the image fills the frame corner to corner instead of in a circular shape.

I brought the version II with NX mount. I was not sure between this lens or the Samsung NX 10mm fisheye lens. The NX lens has all the "extras" that would make it great (electronic extras like auto focus and exposition, and the feature button etc).

Very easy to use. Extremely sharp! I would buy this lens again.