Orion 2" Multiple 4-Filter Wheel

Anodized aluminum filter wheel conveniently allows switching of up to four 2" astrophotogrpahy and/or eyepiece filtersEssential time-saver for tri-color astrophotography with large-format monochrome CCD camerasT-threads on the camera side of the filter wheel allows secure, threaded attachment to most astrophotography camerasFilter wheel includes 2" nosepiece for easy attachment to any 2" telescope focuser or accessoryHelps protect your imaging filters from dust , dew, and scratches during use

Source: Digital Camera and Video Store...