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.

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)

What’s Included

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

• Front and rear lens caps 

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