Solomark 5-position 2inch Manual Filter Wheel / Revolver for Astronomical Telescope It is 5-Position 2" Filter Wheel For Telecope and high-quality telescope filter wheel allows you to quickly and easily change . Its very sturdy aluminum housing makes it also suitable for heavy cameras. The filters can be changed very quickly at any time, even with the camera mounted or with the eyepiece inserted. The filter wheel can be attached to your focuser either by the supplied 2 nosepiece adaptor or via a T-thread. Its construction is impermeable to light and thus ensures reflection-free astrophotography.