The Russian Helios-40 is one of the greatest lenses made in the USSR. This lens has a 39 mm
SLR mount, and was intended for use with the early Zenit cameras (Zenit,
Zenit-S, Zenit-3, Zenit-3M, Kristall), but its optical registration (back
focus) is the same as in the Universal Pentax Screw Mount, so with a simple
39 to 42 mm adapter ring (not included but can be made or found) the Helios-40
can be used with any 42 mm Pentax Screwmount camera.
The lens is large, heavy, it has a lot of glass and metal. The aperture is a “preset” type – there are
two rings. You set the aperture with one (it has stop-clicks), and after
the focusing is completed, you close the aperture to the preset value
with the second ring without taking your eye from the viewfinder. The
lens has a built-in 3/8″ tripod mount.
The lens has a very shallow depth-of-field, and this allows to make great portrait pictures. You can easily control the sharpness of the background with the aperture.
||1:1.5 (settings from 1.5 to 22)|
||1m – Infinity|
||M39x1 mm. This is the same mount as in the Leica Thread Mount Lenses, but the optical registration is different.|
This Helios-40 lens was made by the KMZ plant in 1965. It is in EXC condition, the exterior shows little, mechanics are smooth and the glass is clean. The lens comes with a front and rear caps, filters and a leather case.
The lens is shown on a Zenit-3M SLR (camera not included).