The sharpness is up in the border areas really very good. Even when fully open aperture the performance is amazing. Mostly I use Aperture 5.6. The Aspheric lens provides little chromatic aberration. I am very pleased with the results of the OM-D and would recommend it in any case further. The picture angle is about 132-134 ° and not at 180 °, but of course, taking care that no camera straps, feet or similar things slip in the subject)
The processing is basically high. To complain about is in my view the attachment of the lens cap on the - on the lens firmly seated - the lens hood. The clamping mechanism scratched the Geli unfortunately very. Looking after a short time very shabby. Since you can not swap the Geli, it is all the more annoying, so I pull the last star for this.
All in all, the Samyang / Walimex 7.5mm Top-lens at a reasonable price that everyone mFT users should look closer.
It must also not necessarily be the large panoramas that you created with such a lens. With a little imagination can be exciting viewing angle (see example screenshot) produce.
4 stars and a buy recommendation.