Fantastically good but limited use

The lens is superior in its optical power beyond any doubt, that have confirmed enough. I would like to add something.
Please consider carefully whether you need the lens. Pure fisheye images are actually tapped for 30 years and used sparingly still welcome. Frequent application should now probably be the panorama, and here it is for spherical panoramas probably one of the best, if not the number one. Bock sharp edge to edge, blooming behavior excellent flares very mild, if at all. For this purpose the push actually the price is already low even then.
For cylindrical panoramas due to the distortion, it is not working. I use PTGui and have operated the lens on a 7D (Crop).

Interesting way, and due to the minimum focusing distance of this lens probably are unique nature close-up with open aperture :-)

Yet few points:
1. Remove the cover. This holds very firmly, however, opens the lower lock (two exist above, below) at the mere drop the camera. That should urgently be amended by Canon, because the lid can now easily fall off. The sun visor itself is very well locked.

2. Chromatic aberrations can be in Lightroom 5 very good, correct in Digital Photo Professional fairly and in DXO Pro 8 only tedious and manual

3. exist for the lens does not (currently July 2013) correction profiles for LR, DPP or DXO. In DXO the image can manually equalize perpendicular back in LR no. DPP can not in principle anyway. (For those who want only an undistorted Super Wide Shot times easy)

4. Set In Panos with PTGui the lens absolutely manually frame on Circular Fisheye or Fisheye Full. The automatic over EXIF ​​has at me does not work, what I have seen until late and produced extreme Failed to calculate.