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.[1]
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.[2]
List of credited lens designs edit
Hirakawa is credited with designing:
- DA 10-17mm f/3.5-4.5 Fisheye (co-developed with Takayuki Ito)[3]
- DA 14mm f/2.8[4]
- DA 40mm f/2.8 Limited[1] (based on the smc PENTAX-M 1:2.8 40mm)[5]
- DA 50-200 f/4-5.6[citation needed]
- smc DA 55-300mm F4-5.8 ED[citation needed]
- DA* 55mm f/1.4[1]
- F 17-28mm f/3.5-4.5 Fisheye[6]
- F 35-80mm f/4-5.6[7]
- F* 600mm f/4[8]
- FA 28-105mm f/4-5.6[9]
- FA 28mm f/2.8 AL[10]
- FA 28mm f/2.8 SOFT[11]
- FA 35mm f/2[1]
- FA 43mm Limited[12]
- FA 70-200mm f/4-5.6[13]
- FA 77mm Limited[12] (based on the smc PENTAX-A* 1:1.4 85mm)[14]
- FA* 24mm f/2[15]
- FA* 80-200mm f/2.8[16]
- FA* 85mm f/1.4[17]
- FA* 600mm f/4[8]
- Tamron SP 24-70mm f/2.8 (2011)[18]
- Unreleased 31mm f/2.4 prototype for the FA Limited series[19]
- Unreleased wide-angle (80mm on 6x7 or 65mm on 645) f/2.8 (1986)[20]
- Unreleased 70-300mm f/4-5.8 (1987)[21]
- Unreleased 100-400mm f/5.6 (1992, with Koichi Maruyama)[22]
- Unreleased 400mm f/4.5 (1988)[8]
References edit
- ^ a b c d RiceHigh (6 October 2010). "The Very Different Fates of Two ex-AOC Top Optical Engineers". RiceHigh's Pentax Blog. Retrieved 8 November 2017.
- ^ RiceHigh (8 July 2013). "News: Mr. Jun Hirakawa Now Works for Tamron and Mr. Blurry Cameraphone has Left Pentax China". RiceHigh's Pentax Blog. Retrieved 8 November 2017.
- ^ US patent 7317581, Ito, Takayuki & Hirakawa, Jun, "Fisheye lens system and a fisheye zoom lens system", published 2008-01-08, issued 2008-01-08, assigned to Pentax Corp.
- ^ US patent 7116499, Hirakawa, Jun, "Wide-angle lens system", issued 2006-10-03, assigned to Pentax Corp.
- ^ "SMC Pentax-DA 40mm F2.8 Limited Reviews - DA Prime Lenses - Pentax Lens Reviews & Lens Database".
- ^ US patent 5724193, Hirakawa, Jun, "Super wide angle zoom lens", published 1998-03-03, issued 1998-03-03, assigned to Pentax Corp.
- ^ US patent 5546232, Hirakawa, Jun, "Two-group zoom lens", issued 1996-08-13, assigned to Pentax Corp.
- ^ a b c US patent 4904070, Hirakawa, Jun, "Telephoto lens system", issued 1990-02-27, assigned to Pentax Corp.
- ^ US patent 5264965A, Hirakawa, Jun, "Zoom lens", issued 1993-11-23, assigned to Pentax Corp.
- ^ US patent 5233474A, Hirakawa, Jun, "Wide-angle lens system", issued 1993-08-03, assigned to Pentax Corp.
- ^ US patent 5822132A, Hirakawa, Jun, "Soft focus lens", issued 1998-10-13, assigned to Pentax Corp.
- ^ a b http://gw.org.za/images/Lens%20Technical%20and%20Trial%20Use%20Reports.%20SMC%20Pentax%20FA77mm%20and%20FA43mm.%20Hirakawa%20Jun%20and%20Adachi%20Masamitsu,%202000.pdf [bare URL PDF]
- ^ US patent 5061053A, Hirakawa, Jun, "Telephoto zoom lens system", issued 1991-10-29, assigned to Pentax Corp.
- ^ "Login • Instagram". Archived from the original on 26 December 2021.
{{cite web}}: Cite uses generic title (help) - ^ US patent 5546232A, Hirakawa, Jun, "Wide-angle lens system of a retrofocus type", issued 1990-06-19, assigned to Pentax Corp.
- ^ US patent 4934797A, Hirakawa, Jun, "Inner focus type telephoto zoom lens", issued 1996-11-05, assigned to Pentax Corp.
- ^ US patent 5172274A, Hirakawa, Jun, "Large aperture, medium telephoto lens system", issued 1992-12-15, assigned to Pentax Corp.
- ^ JP patent 5722730B2, 純 平川, "The camera shake correction zoom lens", issued 2015-05-27, assigned to 株式会社タムロン
- ^ RiceHigh (16 August 2011). "RiceHigh's Pentax Blog: Some "Lost Stories" About the Three FA Limited Lenses". Ricehigh.blogspot.com. Retrieved 30 March 2018.
- ^ US patent 4747676A, Hirakawa, Jun, "Wide-angle seven-element lens system", issued 1988-05-31, assigned to Pentax Corp
- ^ US patent 4836663A, Hirakawa, Jun, "Telephoto zoom lens system", issued 1989-06-06, assigned to Pentax Corp
- ^ US patent 5448412A, Maruyama, Koichi & Hirakawa, Jun, "Telephoto zoom lens system", issued 1995-09-05, assigned to Pentax Corp
External links edit
- 平川純 on LinkedIn
- Hirakawa, Jun (January 2000). "レンズテクニカルレポート SMCペンタックスFA77mmF1.8リミテッド FA43mmF1.9リミテッド" [Lens technical report. SMC Pentax FA77mm, F1.8 Limited and FA43mm, F1.9 Limited.]. Photographic Industries. 58 (1): 78–81. Retrieved 8 November 2017.
- Nyquist, Greg (18 August 2012). "Lessons from a Legendary Lens Designer". The Northcoast Photographer (blog). Retrieved 7 November 2017.
- Hirakawa Jun on Camera-wiki.org
- Hirakawa patents on patentgenius.com
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