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KO-140М 140 mm f/ 1.8 Lens

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KO-140М 140 mm f/ 1.8 lens

KO-140М 140 mm f/ 1.8 lens

KO-140М 140 mm f/ 1.8 lens

Format: APS-C (crop)

Type: Prime lens

Focusing: Manual Focus (MF)

Lens mounts: Other mount

Optical design: 4 elements in 2 groups

User reviews (1)

Photos (17)

Tests (0)

Owners (1)

Views (6042)

Average price: $30


Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr/oz)Length (mm/in)
140mmf/1.8f/1.8no 778/27,4181/7,1

Additional information:


The KO-140М  is a fast lens designed for projecting  35 mm motion pictures. The lens employs a four-lens aplant design, also known as the Petzval lens.  This results in a considerable field curvature.The optical elements are covered with a single-layer  chemical coating.


Additional information:

  • Back focal distance: 52.43 mm
  • Resolution (projecting), center/edge:  75/40 lpmm
  • Rim diameter: 62.5 mm
  • Max. diameter: 87 mm

Posted by: kleo59   Date of publication: 24.03.2013

Photos taken with this lens KO-140М 140 mm f/ 1.8:

Girl portrait
Autor: AdisX
5 0 1330

BW portrait, backlighted
Autor: AdisX
5 0 1060

Autor: AdisX
5 0 1183

Girl portrait
Autor: AdisX
4.33 0 1263

Mechanical quality3.805
Optical quality3.805
Pricing / Value3.605
Overall lens rating

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Owner reviews: KO-140М 140 mm f/ 1.8

AdisX 04.04.2015 14:12:51
Period of use: 3 months

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


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


I use 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, but has very strong field curvature. Bokeh has tendency to swirl.

p.s. Back focal distance (from lens): is not 52.43 mm, but about ~63mm