SVBONY SV161 Double Helical Focuser for Telescope Finder Guidescopes, 1.25-inch High-Precision, with Brass Compression Ring (M42x0.75)

This double helical focuser features an M31x0.5 male thread on one side and an M42x0.75 male thread on the other, crafted from durable, full-metal construction. The other side features a male T-thread flange (M42x0.75) and an accessory thumbscrew for mounting a StarShoot autoguider or 1.25-inch eyepiece. The focuser features a female T2 thread on the telescope side, allowing for 1.25-inch instruments to be mounted on the eyepiece/camera side. This high-precision double helical focuser is designed for guiderscope/finderscope interfaces, providing a solution for telescopes and telephoto lenses with loose focus. The focuser has a fixed orientation, preventing the attached camera or eyepiece from rotating, and the guide star's field of view from focusing also does not rotate. It has a focusing stroke of 10mm, a minimum length of 43mm, and a maximum length of 53mm. Interface: 1.25 inch with M42x0.75 male thread.