Leitz Wetzlar Focotar 50mm f/4.5. This enlarger lens from Leitz has been adapted to an M42 helicoid mount adapter. In the past, it was said that Leica photos were "burned" with the Focotar, a lens indispensable for Leica photography, known for its ability to print detailed images onto photographic paper. This lens has no chemical burns and is in beautiful condition, both externally and optically. The M42 mount has been adjusted for infinity focus on an Eos mount. With no aberrations and high resolution, it delivers the best performance for product photography. Thank you for your consideration.