Vixen Dovetail Mount for MTO-500 (ZM-5C) Lens

Vixen-compatible mount designed for the legendary Soviet mirror lens MTO-500 (ZM-5C).

The mount consists of two parts that are joined together using four M3×12 screws.
You will also need four M4 nuts, and dedicated hex pockets are included in the design.

This adapter allows the lens to be mounted securely on Vixen-style dovetail systems, making it suitable for astronomy mounts, trackers, and astrophotography setups.

My particular lens was manufactured in 1968 and reached me in near-perfect condition. Because of that, I wanted the mount to treat this beautiful piece of engineering with care.

To protect the lens body from scratches, I applied felt or another soft lining material.
In my case I used felt strips 28 mm wide with a thickness of approximately 1.7 mm.

This mount makes it easy to use the MTO-500 in:

• astrophotography setups
• telescope mounts
• star trackers
• lunar and solar imaging

A simple way to give classic vintage optics a second life in modern astronomy setups.

Hardware Required

• 4 × M3×12 screws
• 4 × M4 nuts
• felt or soft lining 28 mm wide (~1.7 mm thick)

Print Settings

Recommended materials: PLA, PETG
Layer height: 0.2 mm, Walls: 4 perimeters, Infill: 25–40%, Supports not required