Available with 97-percent Silver Enhanced coatings or 99-percent Dielectric Coatings, includes a 1.25-inch adapter for 1.25-inch eyepieces and also includes Denkmeier's special thread-on visual back for SCTs, aluminum plug and large 2-inch aluminum thread-on sealing cap for telescope-side tube. 100-percent compression fittings throughout. Choose the Shorty Version for use with SCTs that are smaller than 10-inch to allow extra clearance of the fork base. LX90 users should choose Power x Switch Star Diagonal #S2. New Carbon Fiber Side Covers on all Dielectric Models:The diagonal housings and mirrors are produced specifically for Denkmeier Optical by William Optics. The modular nature of the William Optics diagonal plus the outstanding attention to detail convinced Denkmeier that a joint effort would result in a very amazing product. The mirrors on all Denkmeier Power x Switch Diagonals are figured to a lambda/10 flatness and are 10 mm thick. The Power x Switch:The Power x Switches feature 2-inch format, fully multi-coated (FMC) optics that deliver sharp, contrasty images. The Power x Switches are machined here in the USA and assembled in the Denkmeier Maryland facility. They undergo rigorous quality control. The Sky Is Yours:Ever look at the Dumbbell (M27) in an SCT with a focal reducer? Normal F/10 power? What about with a 2x Barlow? Move on to The Ring and M13. Care to do the same? We all know that threading a reducer on and off for every object is not realistic, especially when it starts getting cold... or when it's warm and the bugs are biting! Now you can and will examine every object at three magnifications because it is instant and easy. Denkmeier Product Number: PSDS1D Customer Note: All Denkmeier Power Switch Star Diagonals were compacted with the "armless" Power Switch Carrier design. Denkmeier introduced this more than one year ago! They are in the process of changing their manual photos. If you order any Power Switch Star Diagonal, you will receive the compact armless version.