Filters 500nm 2''

Specifies the product's connection or connection thread on the telescope connection end. The same adapter dimension must always be available on the telescope.

A standard measurement for accessories, expressed as 2 inches. 2" is equal to 50.8 millimetres.

The optical elements are treated with ultra-thin coatings. Among others, there are anti-reflective coatings for reducing, and dielectric coatings for increasing reflection.

No matter whether they are for observing or for astrophotography, filters are very important accessories.