M42 macro extension tupe

thingiverse

A custom-built macro extension ring designed specifically for use with M42 lenses, allowing photographers to experiment with macro photography capabilities on their EOS 750D camera, paired with older M42 lenses. The ring was created with the intention of enabling users to take advantage of these vintage optics for close-up shots. It's worth noting that attaching this tube directly to a Canon EF lens mount is not feasible; instead, a M42 to EF adapter must be used in conjunction with the extension ring.