Name: Cosina Wide-Angle 3.8/20 MC
Tested On: Canon EOS 350D / Canon EF-M
Focal Length: 20mm
Maximum Aperture: f/3.8
Minimum Aperture: f/22
Diaphragm Blades: 5
Price Paid: € 55,-
Serial Number (or Approx.): 910xxxxx
Product Ratings (1=miserable, 5=excellent):
Construction Quality: 4
Image Quality: 3.5
Overall Value For Price: 4
Recommended: Yes, unless professional performance is needed
My copy of this lens comes with the Nikon-F-mount and AI-functionality.
This lens is interesting since with its focal length of 20mm it provides wide angle photography even at a crop DSLR (at a Canon EOS 350D its FoV is similar to a 32mm lens at a full frame or film cam.)
The colours are nice and quite close to reality, contrast is fine but not too strong. The sharpness this lens produces is only mediocre and sometime leaves a bit to be wanted, especially when wide open. If you can shoot at f8, lack of sharpness is no issue any more.
Flaring is not a huge problem, either. In some difficult situations you can see some flares, but the coating seems to be a rather good one.
Some kind of drawback is the slight distortion. It is much better than you will find in most zoom lenses (even at 28mm) but it still is visible, also at a crop DSLR. So this Cosina is, as far as distortion is concerned, no match for the CZJ Flektogons which are much better corrected.
The best part of this lens is its price. You can get this lens for half the price of a Flek 4/20.
As a final verdict, I would say that the Cosina 3.8/20 will disappoint a pro but can be a very nice lens for somebody who looks for an affordable 20mm MF lens and is willing to accepts some faults that can be corrected with post-processing.
Originally posted at 11:33AM, 17 June 2008 PDT
LucisPictor edited this topic 25 months ago.