Carl Zeiss Jena Flektogon 35mm f2.8 Zebra M42

Single coated - Flektogon 35mm f/2.8 - Zebra. 
F-stop Scale from 2.8 to 22. 
The minimal focusing distance is 18cm is well suited for macro photos. 
5 blades diaphragm. Solidly constructed, only metal and glass.

Optics: ★★★★☆

Superior colors. Nightmarish flare. Perfect for macro photography.

Ergonomics: ★★★☆☆

To change aperture, press the button. A very no convenient solution.

Build quality: ★★★★★

Solid construction.

Market value / value of subjective: ★★★★☆

Less than $ 150 is a very good price.

Here are some sample pictures.

They were made with Sony Alpha 300.

All photos without amendment in graphics programs.