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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)

References

1. ^ RiceHigh (6 October 2010). "The Very Different Fates of Two ex-AOC Top Optical Engineers". RiceHigh's Pentax Blog. Retrieved 8 November 2017.
2. 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.
3. 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. 
4. US patent 7116499, Hirakawa, Jun, "Wide-angle lens system", issued 2006-10-03, assigned to Pentax Corp. 
5. "SMC Pentax-DA 40mm F2.8 Limited Reviews - DA Prime Lenses - Pentax Lens Reviews & Lens Database".
6. US patent 5724193, Hirakawa, Jun, "Super wide angle zoom lens", published 1998-03-03, issued 1998-03-03, assigned to Pentax Corp. 
7. US patent 5546232, Hirakawa, Jun, "Two-group zoom lens", issued 1996-08-13, assigned to Pentax Corp. 
8. ^ US patent 4904070, Hirakawa, Jun, "Telephoto lens system", issued 1990-02-27, assigned to Pentax Corp. 
9. US patent 5264965A, Hirakawa, Jun, "Zoom lens", issued 1993-11-23, assigned to Pentax Corp. 
10. US patent 5233474A, Hirakawa, Jun, "Wide-angle lens system", issued 1993-08-03, assigned to Pentax Corp. 
11. US patent 5822132A, Hirakawa, Jun, "Soft focus lens", issued 1998-10-13, assigned to Pentax Corp. 
12. ^ http://gw.org.za/images/Lens%20Technical%20and%20Trial%20Use%20Reports.%20SMC%20Pentax%20FA77mm%20and%20FA43mm.%20Hirakawa%20Jun%20and%20Adachi%20Masamitsu,%202000.pdf
13. US patent 5061053A, Hirakawa, Jun, "Telephoto zoom lens system", issued 1991-10-29, assigned to Pentax Corp. 
14. "Login • Instagram". Archived from the original on 26 December 2021. {{cite web}}: Cite uses generic title (help)
15. US patent 5546232A, Hirakawa, Jun, "Wide-angle lens system of a retrofocus type", issued 1990-06-19, assigned to Pentax Corp. 
16. US patent 4934797A, Hirakawa, Jun, "Inner focus type telephoto zoom lens", issued 1996-11-05, assigned to Pentax Corp. 
17. US patent 5172274A, Hirakawa, Jun, "Large aperture, medium telephoto lens system", issued 1992-12-15, assigned to Pentax Corp. 
18. 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 
19. RiceHigh (16 August 2011). "RiceHigh's Pentax Blog: Some "Lost Stories" About the Three FA Limited Lenses". Ricehigh.blogspot.com. Retrieved 30 March 2018.
20. US patent 4747676A, Hirakawa, Jun, "Wide-angle seven-element lens system", issued 1988-05-31, assigned to Pentax Corp 
21. US patent 4836663A, Hirakawa, Jun, "Telephoto zoom lens system", issued 1989-06-06, assigned to Pentax Corp 
22. US patent 5448412A, Maruyama, Koichi & Hirakawa, Jun, "Telephoto zoom lens system", issued 1995-09-05, assigned to Pentax Corp 

External links

• 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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