Lets review objective photo lens Opteka 12mm f/7.4 HDMC Fisheye Lens for Sony E mounts. As it is seen from its name, it has 12 mm focal distance; f/7.4 fixed diaphragm, because of this it is not very light; field of view is 167 degrees; and minimal focusing distance is 0.28 m. It has 4 lens elements in 4 groups, all of them are made from optical glass and are covered with protective and anti-reflective multicoating. Objective weight is 198 g, and sizes are : 65 ( height ) x 57 ( diameter ) mm. Also, there are variations of objective lens with f/8 diaphragm and 7.5 mm ( for Nikon 1 mount ) and 9 mm ( for Micro Four Thirds mount for Panasonic and Olympus cameras ) focal distances. Package contains : Opteka 12mm f/7.4 HDMC Fisheye Lens objective photo lens itself, frontal and rear caps, carrying and storage pouch and users guide. All in all, it is a good photo lens with adequate price, low optical elements amount ( this reduces light dispersion and internal reflections on surfaces ) and variations for different mounts. Its light strength is relatively low, but it is inherent to all fish-eye lenses, because they gather light with the same input lens diameter for much larger field of view.