Jun Hirakawa

Mr. Jun Hirakawa (平川純) is a Japanese lens designer best known for creating the Pentax FA 43mm Limited and FA 77mm Limited lenses during his time at Pentax.

Hirakawa said at the time that he regretted his "early retirement" from Pentax in 2010, around the time that Hoya acquired the company, and was subsequently hired by Tamron.

List of credited lens designs
Hirakawa is credited with designing:
 * DA 10-17mm f/3.5-4.5 Fisheye (co-developed with Takayuki Ito)
 * DA 14mm f/2.8
 * DA 40mm f/2.8 Limited (based on the smc PENTAX-M 1:2.8 40mm)
 * DA 50-200 f/4-5.6
 * smc DA 55-300mm F4-5.8 ED
 * DA* 55mm f/1.4
 * F 17-28mm f/3.5-4.5 Fisheye
 * F 35-80mm f/4-5.6
 * F* 600mm f/4
 * FA 28-105mm f/4-5.6
 * FA 28mm f/2.8 AL
 * FA 28mm f/2.8 SOFT
 * FA 35mm f/2
 * FA 43mm Limited
 * FA 70-200mm f/4-5.6
 * FA 77mm Limited (based on the smc PENTAX-A* 1:1.4 85mm)
 * FA* 24mm f/2
 * FA* 80-200mm f/2.8
 * FA* 85mm f/1.4
 * FA* 600mm f/4
 * Tamron SP 24-70mm f/2.8 (2011)
 * Unreleased 31mm f/2.4 prototype for the FA Limited series
 * Unreleased wide-angle (80mm on 6x7 or 65mm on 645) f/2.8 (1986)
 * Unreleased 70-300mm f/4-5.8 (1987)
 * Unreleased 100-400mm f/5.6 (1992, with Koichi Maruyama)
 * Unreleased 400mm f/4.5 (1988)