Exakta lenses to Pentax Q adapter with IHAGEE M40 macro tube

thingiverse

Just scored this #135 Sun Telephoto 135mm f3.8, a fantastic 1950s lens with Exakta mount, for a mere $4.99 at the thrift store. I snatched it up together with IHAGEE macro tubes and couldn't wait to give it a try. The Pentax Q seems like the perfect candidate. The flange focus distance of those Exakta lenses is 44.7mm, but the Pentax Q's flange distance is about 10mm, so my lens needs a tube roughly 35mm long to focus properly. I could print a 35mm tube with Q bayonet on one end and an Exakta mount on the other, but those lenses are heavy, which would likely cause mechanical failure in the EXA's complicated bayonet. A smarter approach is to reuse one of those IHAGEE macro tubes - they're abundant and cheap because not much can be done with them now. These multi-sectional tubes have M40x0.75 threads between sections, making it easy to get the correct size. I decided to create a smaller adapter with Q bayonet on one side and internal M40x0.75 threading on the other to accommodate the few IHAGEE tube sections with Exakta mounts at the end. I'm extremely satisfied with the outcome!