Reducers / Flatteners
Reviews
Excerpt from review of TRF-2008 0.8x Reducer/Flattener in Sky & Telescope magazine.
[T]he 0.8x Reducer/Flattener performs superbly. Star images are perfectly round to the very corners of the field, and there is minimal vignetting. A high-magnification examination of the images reveals little, if any, secondary color even at the edge of the field.
— Cook, C. "Test Report: Less Magnification for Photography". Sky & Telescope (July 1999). Full Review.