Overview

The Kenko 400mm f/8 mirror lens is compact, lightweight (~500g), and affordable (~$260), making it a budget-friendly super-telephoto option. Optically, it offers good sharpness and low chromatic aberrations, but suffers from reduced global contrast, a hazy look, and distinctive "donut" bokeh. Build quality is solid with a metal body and smooth focus ring, though the focus throw is short and manual focus is challenging in dim light. It suits enthusiasts seeking long reach on a budget, who can work with manual focus and fixed f/8 aperture.