Glossary | Telescope accessories | Capacity | Frame
The frame allows the filter to be attached to a connector, a filter holder or in the housing of a camera.
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.
Filters that are attached or screwed onto the lens.