Maker Ricoh Imaging Type Zoom Focal length 20-40mm | Lens mount(s) Pentax KAF3 Focus drive Micromotor Aperture (max/min) f/2.8 - f/4.0 | |
The HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR is an advanced standard zoom lens for Pentax APS-C DSLR cameras announced by Ricoh on November 6, 2013. Being part of Pentax's Limited series, it features a metal barrel and a comparably small form factor. Within the Limited series, it is the first zoom lens as well as the first lens to feature a silent built-in autofocus motor (DC) and weather resistance (WR).
References
Pentax DA 20-40mm Limited lens Wikipedia(Text) CC BY-SA