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Glossary | Telescope accessories | General | Type of build | Vixen

A standard measurement for prism rails and clamps, introduced by the manufacturer Vixen.

When it comes to attaching telescopes to mounts, two standards have been established: the relatively narrow rails introduced by the Japanese manufacturer Vixen and the wider Losmandy rails. The latter are 3 inches wide and are mainly used for heavy telescopes.

Most telescope manufacturers follow these standards. Losmandy in particular also offers accessories that follow the Vixen standard.