Early lens (prototype) KMZ Helios 58mm 1:2 44M, A/M aperture suitable for M42

he Helios 44M is a six-celled anastigmat with single-layer or multi-layer (MS) clarification based on the Biotar 2/58 lens (Carl Zeiss Jena).

According to the optical scheme - planar. One of the most common lenses of the USSR, which were equipped with cameras Zenit mount M42.

the documents say February 27, 1974 very rare

Specifications:

Format: 35mm mirror

Type: Constant focal length (fixed)

Focus: Manual Focus

System: M42

Optical design: 6 elements in 4 groups

Focal length: 58mm

Aperture: f / 2.0 - f / 16

Petal Aperture: 8

Diameter of filter thread: 49mm

Weight: 270g

Length: 42mm

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