KO-120М 120 mm f/ 1.8 Lens

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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 (13908)

Average price: $10

Specifications:

Focal length	Max. aperture	Min. aperture	Blades	Min. Focus (m.)	Filter Ø (mm.)	Weight (gr/oz)	Length (mm/in)
120mm	f/1.8	f/1.8	no			655/23,1	150/5,9

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

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

All photos

winter
Autor: AdisX

2979

portrait
Autor: AdisX

2083

portrait II
Autor: AdisX

2623

***
Autor: nukemall

3.89

2515

Mechanical quality	3.80	5
Optical quality	3.40	5
Usability	2.60	5
Pricing / Value	5.00	5
Bokeh	4.00	5
Overall lens rating	3.76

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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

Strengths:

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

Weaknesses:

very strong field curvature
very low contrast
flare
no focussing mechanism

Comments:

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.

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