Overview

The Bausch & Lomb 800mm f/10 Lightweight Mirror lens is an ultra-telephoto prime that doubles as a spotting scope. Optically, it performs better than many adapted mirror telescopes but falls short of dedicated lenses like the Olympus OM Zuiko 500mm f/8 Reflex. A user reports it is not sharp in the center and has weird edge performance on full-frame. Build-wise, it is relatively lightweight and includes a star diagonal and eyepiece. It suits users wanting a dual-purpose lens/scope who are not picky about top optical quality.