I had some initial issues with getting the Carl Zeiss Planar 50mm F/1.7 T* to focus. I guess the main issue is that this being a manual focus lens, one must have really sharp eyes. I am already convinced what this excellent lens is capable of — amazing colors and sharpness even at 100% crop. Fine-tuned the adapter recently and here are some test shots taken today at F2.8. Pictures straight from camera, with no post-processing nor sharpening.