The Baader UFC universal filter changer is an inexpensive solution for both telescopes and cameras.
Large telescope-sided diameter of 65mm. Adaptable to fit both 2″ filters , unmounted 50.4mm and 50×50 square filters. Multiple accessories such as extensions and stray light flanges available. As I add this blog post, more adaptors are under preparation.
This is all in all a great accessory for photo / visual use