I got the test results back using the Contax to LTM adapter made by Amedeo Muscelli. I am very happy with the results. I tested it using it my Zeiss 5cm F1.5 and Menopta 53/1.8. Both are Contax mount lenses. Zeiss 50mm (Edited from 'cm') F1.5, later model that dropped the "Opton" from the name. Wide-open on the Canon 7, metered using the camera's selenium meter. And with the Menopta 53/1.8 wide-open. This is an export version of the Helios-103.