Orion 5522 5-Position 1.25-Inch Filter Wheel

From the Manufacturer

Handy and versatile wheel holds up to five 1.25" filters for visual and/or imaging use. A huge time-saver for filtered planetary and lunar observation using different color filters, or for tri-color astrophotography pursuits. Holds up to five 1.25" filters, or you can leave one space blank for unfiltered viewing - requires additional 20mm focus travel. Requires additional 20mm of focus travel - not recommended for use with Dobsonian reflectors. Protects installed eyepiece or astrophotography filters from dust, dirt, and impact, and keeps them ready for action