The КО-120М is a fast lens, designed for projecting 35 mm motion pictures. Its optical scheme employs a “four-lens aplant” design, also known as the Petzval lens. This results in considerable field curvature. The optical elements are covered with single-layer chemical coating.
Back focal distance: 52.43 mm
Resolution (projecting), center/edge: 75/40 lpmm
Rim diameter: 62.5 mm
Overall diameter: 77 mm
The lens was manufactured at different plants for dozens of years. That resulted in different frame designs - it could be a turned aluminum unibody, as well as two coupled tubular parts. Thanks to its low price, it was used in very different projection devices. After GOST (Soviet State Standard) had been introduced for cine lens model names, it was manufactured as 35KP-1.8/120 (35КП-1.8/120).
Posted by:nukemall Date of publication: 14.09.2012
I used this lens on full frame Canon 5DIII for portraits. Lens don't have any focussing mechanism, so you must DIY or buy one. Lens can be sharp (enough for portraits), but has very strong field curvature and low contrast, so you use of RAW is a must.
Bokeh has tendency to swirl.