Asahi Optical Co. Super-Takumar 55mm f/1.8

Asahi Optical Co. Super-Takumar 55mm f/1.8 – Standard Prime Lens 

The Super-Takumar 55mm f/1.8, serial number 248884, is a legendary manual focus prime lens made by Asahi Optical Co. (Pentax) in the 1960s. Designed for M42 screw-mount cameras like the Pentax Spotmatic, it is known for its excellent sharpness, buttery smooth focus, and beautiful vintage rendering. The lens's f/1.8 aperture allows for shallow depth of field, great low-light performance, and pleasing bokeh.

This version may also contain thorium glass, which can slightly yellow over time and is mildly radioactive—sought after by some for its unique optical qualities.

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Key Features

• Focal Length: 55mm – slightly longer than a typical standard lens

• Maximum Aperture: f/1.8

• Mount: M42 screw mount – adaptable to many modern digital systems

• Optical Design: 6 elements in 5 groups

• Minimum Focus Distance: ~45 cm

• Aperture Range: f/1.8 to f/16

• Aperture Blades: 6 – produces smooth bokeh

• Coating: Super-Multi-Coating for reduced flare and improved contrast

• Radioactive Element: Some early versions contain thorium glass (mildly radioactive)

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What’s Included

• Super-Takumar 55mm f/1.8 lens (Serial No. 248884)

• Front and rear lens caps 

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Condition

Used – Good condition

• Optics: Clean and clear with no haze or fungus; minor yellowing possible (due to thorium)

• Focus Ring: Smooth and precise

• Aperture Ring: Clicks positively; blades are clean and dry

• Barrel: Light wear consistent with age; engravings clear and sharp

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