20 mm / F3.5 – MIR 20
- Focal length: 20 mm
- Aperture: F3.5
- Minimum Focusing Distance = 0,18 m
When you first take the lens, the convex front lens, which has a wide edging that resembles a lens hood, attracts very much attention.
Features of the MIR 20 3.5 / 20 lens:
The focus of the lens is very smooth. Due to the fact that the front lens forms a kind of lens hood, the focusing ring remains clamped between the camera body and the «blend». The focus ring rotates 320 degrees, thus providing a very precise focus for sharpness. When focusing, the front lens does not rotate, and the lens unit with the front lens moves about half a centimeter from the camera.
The aperture of the lens is only F / 3.5. But the wide-angle is often used for landscapes, and there is no need for a large aperture.
The MIR 20 3.5 / 20 lens shows the depth of field for each aperture value. «Infinity» near the lens begins with 2 meters on the focus scale.
There are different versions of MIR 20 3.5 / 20, some do not support the installation of filters at the front of the lens, some use light filters that are installed near the rear group of lenses.
The lens is very well assembled. Iron and glass.
MIR 20 3.5 / 20 is an ultrawideguide, the focus ring has to be twisted very rarely, and in 90% of cases the lens is focused on infinity.
An unusual feature of MIR 20 3.5 / 20 is the minimum focusing distance, which is only 18 centimeters. This is a very good indicator, you can experiment with the prospect, taking off small objects, flowers, etc. The MIR 20 3.5 / 20 lens has one of the shortest focusing distances among the lenses of this class.
On the crocheted chambers, ultra-wide-angle lenses, MIR 20 3.5 / 20 including, lose their «over wide-angle» and become the usual «wide-angles». Of course, on full-frame cameras MIR 20 3.5 / 20 will be of much greater interest.
MIR 20 3.5 / 20 – an interesting vintage lens, gives excellent sharpness in the center, loses sharpness around the edges of the frame. One of the few Soviet lenses, which creates a really wide viewing angle on the crozed cameras.