Maintenance Report

Found in Asahi Kogaku (Pentax) lenses! Part 2!



at first

I’m sorry

Because we can’t speak english

I am using DeepL translate, so it may be a strange sentence,

but I would like you to understand

Thank you

In this column, we report on a new discovery we made with Asahi Optical Industries’ manual focus lenses.

I will write with reference to the lenses that are on sale at our vintage shop Japan Inc.

ASAHI PENTAX Super-Murti-Corted TAKUMAR 35mm F/3.5

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Click here for column of cleaning work

The minimum focusing distance for a typical manual focus lens is as shown in the image below.

(Reference Minolta MF lens)

In this Asahi Kogaku lens, the minimum focusing distance is displayed inside the notch in the aperture value section as shown here.

This is a method of indicating the minimum focusing distance that is not found in other lenses.

It is quite a revolutionary design.

This design seems to have been discontinued for lenses after the company name was changed to Pentax.


It’s quite a fun time to discover each company’s unique design!

If I make any more discoveries in the design, I’ll put them in the column.

Stay tuned for my next column!

In addition to the above products, we also sell vintage cameras and lenses, so please see the URL below.

Cameras & Lenses

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Animation Goods

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Acoustics and others

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Vintage Shop Japan Inc. Official Website

Official website (English) URL

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Official website (Japanese) URL

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facebook URL

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Instagram URL

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Pinterest URL

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Writer Takashi Okumura