Introduced: ??
Optical design: 9 elements in 6 groups
Lens mount: Micro Four Thirds
Covers: Micro Four Thirds

More info: 

http://www.getolympus.com/us/en/m-zuiko-digital-17mm-f1-8.html

Review: 

http://www.thephoblographer.com/2013/04/25/review-olympus-17mm-f1-8-m-zuiko-micro-four-thirds/

http://www.photographyblog.com/reviews/olympus_m_zuiko_digital_17mm_f_18_review/