Carl Zeiss Jena Flektogon 20mm f/2.8-22.0

Lens categoryUltra-wide
Vendor nameCarl Zeiss Jena
Type nameFlektogon
Focal min (mm)20
Focal max (mm)20
Focus min (cm)19
Aperture max2.8
Aperture min22
Diaphragm blades6
Filter size (mm)67
Carl Zeiss Jena Flektogon 20mm f/2.8-22.0

This is probably one of the most legendary M42 lenses. It is the successor to the 20mm/4.0 Flektogon that created the fame. However, if you plan to use this lens on reduced-frame dSLRs, you may want to re-think it. I found its sharpness and contrast to lack. It is fairly well corrected, but as it’s only one stop faster than most “kit lenses” for dSLRs, there’s little sense to use it there. Cannot comment on its film use.

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  • FIARD Jean-Pierre Martinique French West Indies  14:40 Aug 22, 2005 

    The CZJ Flektogon 2,8/20,even on digital cameras (I use it on a EOS 300D), is a superb lens when used at F8, F11 and F16. It has very deep colour saturation, excellent contrast ( even sometimes too much in my opinion) and an very good resolution. I made comparison with my CANON 1,4/24 L, which is not known to be a bad lens, and, at F8 or F 11 it is very difficult to see a very distinctive difference, even on a up to 150 X 200 cm magnified professional quality computer sreen image. Of course , the Canon 1,4/24 L is very distinctly better at F, 2,8 and F4, but the difference becomes very slight at F8 or F11, and sometimes or in some parts of the test images the Flektogon is better. In the field, the Flektogon 2,8 offers very good or excellent performances, even in situations with much difuse light, for example in pictures with much sky and hyghly diffusing clouds, which is not always the case with The Canon 1,4 /24 L. For this reason, I use more often my recent (it was constructed in 1986) Flektogon 2,8/20 N?? 13 876 than the very expensive and sophisticated Canon 1,4 /24 L ! The 4/20 diffuse much more than the 2,8/20 at F4 and F 5,6, but at F11 it is absolutely superb, with high brilliance and r??solution, very pure and subtle colour rendering and a very good image relief..In conclusion at F8 or F11 these 3 lenses are trully excellent (with a littel more resolution for the Canon L, what is normal for a 24 mm viz a 20 mm, and more contrast than the Flektogon 4/20 at F4 and F 5,6 for the 2,8/20 ) and they represent the top of present actual optical possibilities. Ir you do not need to take a majority of pictures at F 2,8 or F4, the choice of the Flektogon is an excellent one, and, very certainly, you will not do better with any present, and infinitely much expensive, lenses. Please keep in mind that focusing with super wide lenses is very ,very difficult, especially with the very bad digital cameras viewfinders. Don’t take focusing failures for failures of the Flektogons or others.

  • juan rino,Buenos AIres, argentina  00:43 Mar 19, 2008 

    I came in one F4, not 2,8. Very good contrast, at F11 and 16, is crisp. Only at the corners is soft. Good tonality. I use it in B&N. It’s a bargains and good lens.

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