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KO-120М  120 mm f/ 1.8 Lens

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KO-120М  120 mm f/ 1.8 lens

KO-120М  120 mm f/ 1.8 lens


KO-120М  120 mm f/ 1.8 MTF Chart

Optical design

KO-120М  120 mm f/ 1.8 optical design

Format: APS-C (crop)

Type: Prime lens

Focusing: Manual Focus (MF)

Lens mounts: Other mount

Optical design: 4 elements in 2 groups, Petsval

User reviews (1)

Photos (16)

Tests (0)

Owners (3)

Views (13914)

Average price: $10


Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr/oz)Length (mm/in)
120mmf/1.8f/1.8no 655/23,1150/5,9

Additional information:

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

Photos taken with this lens KO-120М  120 mm f/ 1.8:

Autor: AdisX
5 0 2983

Autor: AdisX
4 0 2084

portrait II
Autor: AdisX
4 0 2626

Autor: nukemall
3.89 0 2517

Mechanical quality3.805
Optical quality3.405
Pricing / Value5.005
Overall lens rating

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Owner reviews: KO-120М  120 mm f/ 1.8

AdisX 04.04.2015 14:20:13
Period of use: 10 months

  • good sharpness of focussed part of image
  • fast aperture
  • shallow DOF
  • interesting bokeh


  • very strong field curvature
  • very low contrast
  • flare
  • no focussing mechanism


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.