Focal length 55mm Crop factor 1.5 | Focal length (35mm equiv.) 82.5mm Aperture (max/min) f/1.4 / f/22 | |
The smc Pentax-DA* 55mm f/1.4 SDM lens is a professional prime lens for the Pentax K-mount. It is designed for portrait use with a 35mm equivalent focal length of 82.5mm. The lens features weather sealing, an SDM ultrasonic motor for quiet autofocus, and has 9 rounded diaphragm blades for smoother bokeh. Autofocus speed is similar to an equivalent screwdrive lens.
References
Pentax DA* 55mm lens Wikipedia(Text) CC BY-SA