Asahi Optical Co. Super Takumar 50mm f/1.4-16.0

Lens categoryNormal
Vendor nameAsahi Optical Co.
Type nameSuper Takumar
Product year1965
Focal min (mm)50
Focal max (mm)50
Focus min (cm)45
Aperture max1.4
Aperture min16
Element(s)7
Diaphragm blades6
Filter size (mm)49
Asahi Optical Co. Super Takumar 50mm f/1.4-16.0

Discontinued in 1971.
Lens can be identified from its predesor by observing where the “IR” mark is. If it is inside 4, it is the original 8 element design if it is outside the 4, it is the later 7 element design.
The later design was not modified other than SMC coatings up through the SMC Pentax 50mm f1.4.
The use of a rare earth element in the rear groups cause yellowing over time in the later versions. This yellowing can be bleached out by exposing the elements to UV in the form of sunlight orUV lamp for weeks.

2 Comment(s). Add a comment or Trackback

  • glenn  14:01 Nov 10, 2006 

    What is the “IR” mark?

  • Peter – Buckinghamshire, UK  14:12 Nov 18, 2006 

    Ian, when using Infra-red film the focus needs to be shortened slightly, but of course you cannot do this by eye. To help you get over this, many lenses have an “IR” mark in the Depth of Field scale. After you have focussed the lens by eye, you turn the focus ring until the correct distance is set against the IR mark instead of the normal mark.

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