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Carl Zeiss Jena Flektogon 20 mm f/ 4 Lens

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Carl Zeiss Jena Flektogon 20 mm f/ 4 lens

Carl Zeiss Jena Flektogon 20 mm f/ 4 lens

Carl Zeiss Jena Flektogon 20 mm f/ 4 lens

Carl Zeiss Jena Flektogon 20 mm f/ 4 lens

Optical design

Carl Zeiss Jena Flektogon 20 mm f/ 4 optical design

Format: 35mm SLR

Type: Prime lens

Focusing: Manual Focus (MF)

Lens mounts: M42

Optical design: 10 elements in 6 groups

User reviews (2)

Photos (14)

Tests (0)

Owners (20)

Views (46388)

Average price: $2500


Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr/oz)Length (mm/in)

Additional information:

The Carl Zeiss Jena Flektogon 20 mm f/ 4 is an ultra wide-angle multicoated lens for a 35mm SLR with a M42 screw mount.

Links to online resources:
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Posted by: Sergei Borodin   Date of publication: 02.08.2010

Photos taken with this lens Carl Zeiss Jena Flektogon 20 mm f/ 4:

Autor: Sergei Borodin
5 0 9475

Autor: Sergei Borodin
5 0 7196

Autor: Sergei Borodin
5 0 8196

Wieliczka salt mine, Poland
Autor: stimilek
5 0 2848

Mechanical quality3.9315
Optical quality4.7315
Pricing / Value3.3415
Overall lens rating

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Owner reviews: Carl Zeiss Jena Flektogon 20 mm f/ 4

JMiguel 20.06.2023 06:14:05
Period of use: 5 months


This is a very sharp lens and the images are saturated with beautiful colors. Small and lightweight. I use it for Landscape photography on my Sony a7Rii.


It is dificult to focus because the focus ring is big and in my copy not very smoth. I don't think is a good walk around lens but excellent for landscape photography.


I got my at a very low price, it was mounted in an Exakta camera. The camera was damage, but I opened the lens and fixed,  (it was missing the rubber that goes on top of the focusing ring, I bought a generic one and was able to use it with good results) I manage to salvage the lens and I have used it with excellent results.

Сергей Бородин 1.1.2000 00:00:01
Period of use: 2 years


Incredible picture quality. You can shoot at 15 cm. No optical distortion. Small size and weight.


Construction is not very reliable, although of course much better than the modern plastic. Not too smooth focusing. Expensive 77mm filters. Without the hood catch glares.


Almost a perfect wide-angle lens. It's great to use for shooting HD video on a Canon 5D mark2.

The quality of images compared with the Canon 17-40 L (sharpness in the center and edge, contrast, vignetting, distortion). With a wide margin Flektogon win in all parameters.