ZM-6A 500/f:6.3 Mirror Lens, M42 Mount

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The Russian ZM-6A is a classic sample of Soviet-era engineering and workmanship. It is a 500 mm telephoto mirror lens based on the design of a known Soviet engineer Maksutov. This lens succeded the original MTO-500 lens, which was a heavy, brass unit. "MTO" stands for "Maksutov's Tele Ob'ektiv". ZM stands for Zerkal'nyi (Mirror) Maksutov's. The ZM-6A was much improved, it is a faster lens (1:6.3 vs. 1:8 in the MTO-500). It is also lighter, multicoated, and has a built-in sliding lens hood.

Lens' Specifications

  • Focal length

500 mm

  • Aperture

1:6.3 (fixed, this design does not allow for variable aperture)

  • Field of coverage


  • Focusing

6 m - Infinity (the lenses of this design may focus past infinity, this is done to compensate for thermal expansion)

  • Filter size

M95x1 (4 filters are included)

  • Optical registration (back focus)

45.2? 0.02 mm

  • Mount


  • Dimensions

Max diameter: 100mm (4"), Length: 165mm (6.5")

  • The glass is coated; the barrel is finished in tough black enamel

This ZM-6A was made in 1991. It is in mint condition,looks unused. The glass is clear and clean. The focusing is smooth.

You will need a sturdy tripod to shoot with this lens.

The set includes:

  • ZM-6A Lens with buil-in lens shade.
  • Four filters (Yellow/Green 5.6x, Orange 4x, UV 1.4x, Neutral Density 4x)
  • Metal front screw-in lenscap and plastic rear lenscap.
  • Vinyl Case

The lens is shown mounted on a Zenit 12xp (not included). This ZM-6A can be used with any M42 camera.

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