SVBONY 1.25" CA1 Extension Tube M42 Thread T Mount Adapter and T2 Ring Compatible Nikon DSLR or SLR Camera Photography and Astronomical Telescope Eyepiece Designed for Nikon DSLR SLR camera photography;connect the t ring mount and t mount by M42 threads for camera to telescope;camera adapter;or other astrophotography accessories for direct prime focus photography convenient and easily Super easy to use;eyepiece put into the extended cylinder;then screw t adapter;t ring adapter and extended cylinder together;then attach the camera to telescope manual focusing then get a clear image;fit for Nikon EOS DSLR SLR only The SVBONY extended cylinder length 68mm;the extension tube fits all standard 1.25" telescopes and microscope;it can adjust eyepiece location;get more sharp images and different photographic results High quality aluminum materials;fit any 1.25'' diameter eyepiece holder telescope and microscope;one time purchase for long term use Lifetime warranty;we confidently promise lifetime warranty for each one from us