The smc DA 50mm f/1.8 Lens from Pentax is a fast f/1.8 lens for cameras with a Pentax K mount. In full-frame (35mm) format, this is considered a &quotnormal&quot lens. Mounted to a camera with an APS-C sensor, this lens gives an angle of view equivalent to a 76.5mm telephoto lens--ideal for portraits. The wide f/1.8 aperture makes this an essential lens for working in low light, and it also delivers beautiful bokeh (the out-of-focus portion of a photograph). This lightweight (4.3 oz) lens is very compact--just 1.5&quot (3.8 cm) long. The addition of Pentax Super Protect (SP) coating to the lens helps prevent dust, water, grease and other substances from attaching themselves to a lens and degrading image quality.

Very fast f/1.8 maximum aperture is ideal for low light situations and produces pleasing bokeh in the out-of-focus areas of a photograph

50mm normal lens in 35mm or full-frame format, or 76.5mm telephoto equivalent in APS-C format

The lens is treated with the Pentax's original SP (Super Protect) coating, which repels dust, water, grease, and other substances that may adhere to the surface of the lens. 

Filter Thread Front: 52 mm

Focal Length 50 mm

Comparable APS-C Focal Length: 76.5 mm

Aperture Maximum: f/1.8

Minimum: f/22

Camera Mount Type Pentax K

Format Compatibility 35mm Film / Full-Frame Digital Sensor

DSLR (APS-C Sensor)

Angle of View 31.5°

Minimum Focus Distance 1.48' (45.11 cm)

Magnification 0.15x

Groups/Elements 5/6

Diaphragm Blades 7

Features

Image Stabilization No

Autofocus Yes

Tripod Collar No

Physical

Dimensions (DxL) Approx. 2.5 x 1.5" (6.35 x 3.81 cm)

Weight 4.3 oz (122 g)