This adapter allows using easily available RMS/DIN objectives on Canon EOS cameras which lenses have M58x0.75 filter thread. If you have other camera, but the lens has same filter thread, you'll be able to use this adapter as well. Particularly, I've tested it on my old Canon EOS 300D.
Test picture was made with LOMO Plan 9x objective. Part of dime coin is pictured. First sample picture is original image scaled to 1000px width. Second sample picture is 100% crop from the original. Third picture is laser printed digit (12 pt size).
All pictures are quick shots with handheld camera, so focus isn't perfect. With some patience and camera support, you'll get better results, of course. The pictures just show that this adapter is usable for microphotography.