Overview

The Sigma Mirror 600mm f/8 is a compact, lightweight mirror lens offering 600mm reach at a fixed f/8 aperture. It delivers better image quality than up-sampled zooms under perfect conditions, but suffers from low contrast, softness, and donut-shaped bokeh typical of mirror lenses. Build quality is high, but it is very sensitive to camera shake and requires careful technique, often needing high ISO and a tripod. It suits budget-conscious photographers needing extreme reach who are willing to work around its manual focus and limitations.