Leitz Wetzlar Hektor 1:2.5 200mm projection lens which can also be converted for digital or film taking lens. See what people are doing with this lens. No introduction needed for this other than to mention it comes with the focusing sleeve for the Prado projectors (the lens can be removed only by unscrewing the focusing tab (chrome screw on the side of the focusing sleeve) to prevent the operator dropping it accidentally (so the focusing spiral groove is closed).