Topcon, Tokyo Kogaku RE.Auto-Topcor 1.8/58mm | Camera lens

The objective was produced by Tokyo Kogaku, a Japanese optical manufacturer that later became known as Topcon. It is a standard lens for Topcon SLR cameras, often sold as a kit lens for the Topcon RE-2 model. Its optical design is similar to the Carl Zeiss Planar, with six elements in five groups. S/N 11662966

It is known for its color rendering, especially for the blue tones, and for a soft, painterly bokeh.
The maximum aperture of f/1.8 offers a round bokeh in the center, which tends to a 'cat's eye' effect towards the edges.

It is appreciated for its sharpness at the center even at wide aperture, which extends across the entire frame when stopped down.