Budget 500mm mirror telephoto in universal T2 mount with distinctive doughnut bokeh.
The Centon 500mm f/8 Mirror Lens in T2 mount is a catadioptric telephoto using mirrors to fold the optical path, achieving 500mm reach in a dramatically compact barrel. The T2 universal mount system allows it to be adapted to virtually any camera system via inexpensive mount adapters.
The mirror design creates the distinctive doughnut-shaped bokeh in out-of-focus highlights that divides photographers — some find it characterful, others distracting. The fixed f/8 aperture cannot be changed, limiting exposure control to shutter speed and ISO only. At 500mm f/8, a tripod or fast shutter speeds are essential for sharp results.
Build quality is basic with a lightweight barrel that keeps the lens remarkably portable for 500mm reach. The T2 mount provides universal compatibility through adapters for Canon, Nikon, Sony, Pentax, and virtually any other system. The compact dimensions make this the most portable 500mm option available.
On the used market, the Centon 500mm f/8 Mirror is one of the most affordable ways to achieve 500mm reach on any camera system. For experimenters, beginners wanting to try extreme telephoto, and photographers who appreciate the distinctive mirror lens aesthetic, it provides 500mm capability at negligible cost.