Centon's budget mirror lens — the 500mm f/8 reflex for T2-adapted extreme telephoto on a budget.
The Centon 500mm f/8 Mirror Lens is a budget catadioptric (mirror) lens using T2 universal mount adapted to various camera systems. Mirror lenses use folded optics to achieve extreme focal lengths in compact barrels. The fixed f/8 aperture is inherent to the design. Centon was a UK camera equipment brand offering affordable alternatives.
The mirror lens produces the characteristic doughnut-shaped bokeh in out-of-focus highlights. Sharpness is basic — centre is acceptable, edges soft. The fixed f/8 demands bright conditions. Contrast is lower than refractive designs. The compact size for 500mm is the main advantage. Manual focus only. No aperture control — f/8 is fixed.
T2 universal mount adapted to Nikon — adapts to virtually any camera via T2 rings. Weight is approximately 450 grams — remarkably compact for 500mm. Build quality is basic. Fully manual — no electronics. The T2 mount universality is the practical advantage. Filter thread uses rear drop-in.
Very cheap. Check mirrors and focus. A budget curiosity — 500mm reach at minimal cost and size. The doughnut bokeh and low contrast limit practical use. Any modern 150-600mm zoom is dramatically better. Fun for experimentation. The T2 mount adapts to any camera system.