1、50mm F7 is full width large aperture fixed focusing lens, because lens has large aperture of F7, you can see excellent background blur effect when shooting portraits, you can shoot effect of plane model without going to studio. 2、Full frame lens can be used in full frame SLRS to insure high quality imaging, used in half frame lens to improve quality, creating dreamy and misty photo style. 3、Small size, like other focusing length lenses with same aperture, small and easy to carry, so you won't lose a lot of beautiful scene. 4、50 mm F7 is known for its sharpness and focusing out , more real to show form and stereo perception of objects, do not need to consider zoom, because structure is simple, less lenses can achieve high image quality under particular focusing,can more concentrate on imaging quality, restore real look of things as they are. 5、Made of high quality materials, sturdy, durable and long service life.  1 x Lens Condition: 100% Brand NewItem Type: Camera LensMaterial: Alloy + Optical GlassColor: BlackMount: M42 MountApplicable Model :M42 Mount SLR CameraFocusing Length: Approx.50 mm/2inMaximum Aperture: F 1.7Minimum Aperture: F22Format: 24 x 36 mm/ 0.9x 1.4inNearest Focusing Distance: Approx.45cm/ 17.7inCoating Film: Multilayer Anti-Reflection FilmFilter Interface: Approx.52mm/2inWeight:Approx.283g/10oz