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.^[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

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

^ ^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

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

This article about a Japanese engineer, inventor or industrial designer is a stub. You can help Wikipedia by expanding it.

[twoexecs-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.

[supertele-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.

[industries-12] ttp://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]}

[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

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