Pentax SMC DA 18-135mm F/3.5-5.6 ED AL Macro 2x Teleconverter (4 Elements) with Nwv Direct Microfiber Cleaning Cloth

This 2x teleconverter (doubler) contains four optical elements and doubles the effective focal length of the lens it’s attached to. Designed to extend reach while preserving image quality, it maintains high resolution and strong contrast for sharp, detailed results.