Solomark 1.25 Inch Superior Quality Multiple 9-Position Filter Wheel For Telescope It is 9-Position 1.25" Filter Wheel For Telecope. and high-quality telescope filter wheel allows you to quickly and easily change. The robustly constructed filter wheel is supplied with a 1.25" eyepiece adaptor, 1.25" focuser nosepiece. It is ideally suitable for visual observations with 1.25" eyepieces. 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.