77mm and 43mm Lens technical report by Jun Hirakawa- Scientific Publication

Started Jun 28, 2009 | Discussions thread
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77mm and 43mm Lens technical report by Jun Hirakawa- Scientific Publication
Jun 28, 2009

Lens technical report. SMC Pentax FA77mm, F1.8 Limited and FA43mm, F1.9 Limited.
http://sciencelinks.jp/j-east/article/200006/000020000600A0135383.php

Abstract:

This paper introduces features the titled lenses on the following items: 1) Standard and middle range telephoto lenses for a 35 mm single-lens reflex cameras sold by Pentax, 2) design concept and performance; unique expression with high quality picture, 3) exterior; machined aluminum body to provide high grade sense, 4) focal length; 43 mm (diagonal length of 35 mm size film) and 77 mm (lucky number among 70-80 mm), respectively, 5) both AF and MF operation possible, 6) helicoid screw at focus part provides torque feeling, 7) realization of smooth AF operation by a little reduced gear ratio of drive unit and 8) lens aberration compensation; priority to practical photographs expression than numerical evaluation.

There is also another scientific publication by ADACHI MASAMITSU:

Trial use report. SMC Pentax FA77mm, F1.8 Limited and FA43mm, F1.9 Limited.
http://sciencelinks.jp/j-east/article/200006/000020000600A0135384.php

Abstract:

This paper introduces features of the titled exchange lenses on the following items: for 35 mm single-lens reflex cameras 1) Al exterior provides high grade feeling to both and little allowance at aperture and helicoid parts provides precise structure sense, 2) FA 77 mm/ F1.8 Limited; folded in hood, "finger point" for lens exchange without visual index confirmation, a little noisy in AF operation, good MF operation, natural back and front gradation by circular aperture and soft portrait expression and 3) FA 43 mm/F1.9 Limited; focal length equivalent to diagonal dimension of 35 mm size film and clear and gradation expression by high reflection, multi and ghost-less coated glasses.

For those who does not know, Jun Hirakawa is the lens designer of the 43mm and 77m Limited as well as other Pentax lenses (including the new DA* 55mm f/1.4).

Both articles are published in Photographic Industries journal
ISSN:0371-0106

I wonder if someone from Japan can get access to this journal (from a Library) and scan and post the full articles. This would be very valuable for many Pentaxians.

Cheers,

Voe
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http://www.flickr.com/photos/voe/

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