This filter screws into any standard 48mm filter thread and fits all of our "True-2" and "T-Minus" prime focus adapters. This filter has quality UV Glass mounted in a machined aluminum cell. With pass-through threads for stacking of filters.
We recommend using a filter to prevent dust entry into your camera. This is especially important with Refractor type telescopes as they "pump air" when focused and Reflector type scopes which are open to the air.