Lens Lab
    Sun Tele YS-13 135 mm f/ 2.8
    Sun Tele YS-13 135 mm f/ 2.8

    Sun Tele YS-13 135 mm f/ 2.8

    135mm · f/2.8

    Overview

    The Sun Tele YS-13 135mm f/2.8 is a telephoto prime lens for 35mm SLR cameras via T-adapter. A test photo on a Nikon D5300 shows it is usable at f/2.8, but overall optical performance is not detailed; build relies on the T-adapter system. It suits photographers seeking an affordable, manual-focus telephoto lens for vintage or adapted use, though sharpness and contrast may be limited wide open.