FF Nikon owner with multiple Nikon FX prime and zoom lenses. Now with a very nice new Samyang ultra wide angle lens. Build quality, installation, exposure metering and images are excellent. Manual focusing is no problem with this 12mm lens. This lens produces images as good as my main lenses, you can be a pixel watcher. View the digital images of this lens on Flickr. I use a highly rated Nikon 18-35G lens for wide angle shots and a 12mm lens for ultra wide angle shots. This lens encourages you to be creative, you will want to shoot with it because of the effects it can produce. A very happy owner.