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Glossary > Telescope accessories > Capacity > Right ascension axis diameter

Glossary | Telescope accessories | Capacity | Right ascension axis diameter

The diameter of the right ascension axis is fundamental to the load-bearing capability of a mount.

According to a rule of thumb, when using a refractor, sufficient stability is achieved for astrophotography if the diameter of the axis is around one third of the diameter of the lens. When using a Newtonian telescope, the axis diameter should be one fifth of the mirror diameter.

Source: Handbook of Astronomy, published by Oculum