1.25" with standard thread on both ends

Meade RGB Color Filter Set for Deep-Sky Imager (DSI) Pro       * Add this special CCD color filter set to your DSI Pro and create amazing LRGB and RGB images.       * Includes red, green blue, and inf... [more]

The Optec Intelligent Filter Wheel brings to astronomy a new level of sophisticated equipment for the benefit of the astro-imager. Astro-imaging in this age of astronomy requires the use of many color filters and the management of these filters during ... [more]

2" Orion LRGB Astrophotography Filter Set       * Create dazzling wall-worthy LRGB astrophotos - just like the pros     * 2 inch filter size allows use with larger format monochrome CCDs    ... [more]

Orion SteadyStar Adaptive Optics Guider       * High-speed refractive correction eliminates tracking errors far more effectively than regular autoguiding, resulting in better astrophotos with rounder and more pinpoint stars ... [more]

Orion Nautilus Motorized Filter Wheel 4 x 2"       * Operated by direct USB connection to the PC     * Four 2" filter positions, accepts any Orion or standard 2" threaded filters     * Easil... [more]

Orion Nautilus Motorized Filter Wheel 7 x 1.25"       * Operated by direct USB connection to the PC     * Seven 1.25" filter positions, accepts any Orion or standard 1.25" threaded filters   &nbs... [more]