The 1.25" Superior Quality Multiple 9-Position Filter Wheel requires a light touch to revolve the wheel into its next position with minimal disruption to your scope settings. Each position has a click stop. Inside of the filter wheel has a 42mm T thread. In eyepiece use you fit the nosepiece on the telescope side and the eyepiece holder on the other. For camera use, the eyepiece holder is replaced with the 42mm Male to Male adapter giving you the option to connect your T ring or any other piece of equipment that terminates with a 42mm Female thread. Here's a simply elegant way to dial-in the filter you want for observing or photography. With the 9-Position Filter wheel, you can easily change 1.25" filters without removing your eyepiece or camera. Just rotate the wheel and your filter securely clicks into place, ready to use. You don't even need to leave the eyepiece! Attaches directly to your telescope and accepts 1.25" accessories.LRGB imaging filter set includes 1.25" Luminance (IR cutoff), Red, Green, and Blue filters designed for creating high-quality composite color astrophotos with CCD monochrome imagers. Their anodized aluminum cells thread into the 9-Position 1.25" Filter Wheel.