In my first shoot with the NX1 I only had the rather cheap and cheerful kit zoom on the camera. That doesn’t go any faster than F3.5. I’ve since been ordering in some Canon / Nikon adapters and have found the Sigma ART lenses to be a perfect match for the Samsung NX1 in 4K.
The video footage above was shot very quickly but it should give you an idea of just how superb the NX1’s 4K video really is. Fantastic detail, colour and overall feel.