The Commercial Ektar lenses are single-coated. I have and use the 12" and 14" versions, and am more than happy with the results from them. They are very sharp, contrasty without being too contrasty, and they give wonderful rendition of out-of-focus areas. If the shutter is in good working order, they're worth whatever you paid for it. The Commercial Ektar series were the industry standard for working photographers for many decades, for everything from portraiture to product photography.