Lets review Nikon Nikkor 2137 50mm f/1.8D prime lens for Nikon F mounts. As it can be seen from its name, it has 50 mm fixed focus and maximal and minimal apertures f/1.8 and f/22, accordingly, with 7 diaphragm blades. It has 46 degrees field of view for 36 mm FX sensors and 31 degrees 30 minutes for smaller DX sensors; minimal focusing distance is 0.45 m with support of automatic and manual focusing. It has 6 lens elements in 5 groups, they all are coated with protective and anti-reflective Super Integrated Coating. 52 mm optical filters of Screw-on standard can be attached to it. Objective sizes are 63.5 x 39 mm and weight is : 155 g. All in all it is good objective lens with fixed focus, small lens elements amount and auto focus function, which costs affordable amount of money, in comparison with other objective lenses. Nikon Nikkor 2137 50mm f/1.8D Auto Focus can be recommended to novice and experienced photographers, who want to capture beautiful and clear portrait and panorama photos without zoom.