Glossary | Telescope accessories | Capacity | Connection (to the telescope)
A standard measurement for accessories, expressed as 1.25 inches. 1.25" is equal to 31.8 millimetres.
A standard measurement for accessories, expressed as 2 inches. 2" is equal to 50.8 millimetres.
A thread common to video cameras. To connect to a telescope a C mount to 1.25" adapter is required.
A 2" thread, which can be found on Schmidt Cassegrain telescopes and various accessories.
A thread measurement commonly used in photography