Tele Vue 0.8X Reducer for NP Telescopes - NPR-2073The Tele Vue 0. 8X Reducer for Nagler Petzval Telescopes was designed specifically for the Televue NP127is and NP101is refractors and replaces the discontinued reducer NPR 1073. As part of the Tele Vue Imaging System, this upgraded 0. 8X reducer minimizes vignetting when used with camera sensors up to a 43 mm diagonal, which means it will work with full frame as well as APS sized sensors. When used with a Tele Vue Petzval style telescope, the NPR 2073