Rubinar

Rubinar (Russian: Рубинар) is a Soviet lens design series developed and produced by JSC Lytkarino Plant of Optical Glass (LZOS).

It is compact despite its long focal lengths.

Rubinars can be used with proprietary mount cameras by using M42 adaptors.

Focusing motors are absent though (manual only), and so are the variable apertures.

Rubinar 1:5.6 500 mm
Forsythia with characteristic donut shaped blur ( Bokeh ) due to the presence of the central obscuration in the catadioptric system . Focus on foreground. Rubinar 5,6/500