How to use a lens adapter
Attach the adapter to your lens the same way you would mount the lens on a camera. Align the red dot on the lens with the red dot on the adapter and turn the lens clockwise (counterclockwise for Nikkors) until it locks in place. Look for the red dot on the back of the adapter and line it up with the red dot on your digital camera.
Always mount the lens adapter on the lens and not on the camera. Exceptions are:
- Exakta to MFT and Exakta to Four Thirds adapters which have lens release levers on the front of the adapters.
- Medium format lens adapters with releases on the side of the adapters.
M42 Universal mount lens adapter
The M42 lens mount, also known as Pentax screw mount or universal mount, was invented in 1949 for the Zeiss Ikon Contax S. It was a very popular lens mount during the 1960s and can be easily adapted to a variety of digital cameras.
A lens adapter should have a stop screw ( see arrow) that limits rotation when attaching and removing lenses. Without the stop screw, you won’t know when the bayonet flanges line up with the openings in the lens mount.
Some lens adapters have chips that enable focus confirmation through the camera’s viewfinder. If you don’t trust an unknown manufacturer’s electronics interacting with your camera, don’t use them.
Debris inside new lens adapters
It’s rare that a brand new lens adapter could have debris on the inside from the manufacturing process. Workers can get in a hurry and package the adapter without cleaning it.
Before using any new lens adapter, blow out any debris that could be inside with compressed air. Then take a lint free cloth moistened with rubbing alcohol and wipe down the surfaces. Dry with compressed air.
EF to MFT lens adapter?
You’re probably thinking why would there be a EF to MFT lens adapter if there was no way to control the aperture inside of an EF lens.
Once you get a manual focus lens adapted to EF, you can always take it down to MFT with the EF to MFT lens adapter. The Icarex BM mount is easily adapted to EF but Icarex to MFT lens adapters are scarcer and they cost more. Kodak DKL to EF is another example.
Never force anything
Never force a lens adapter on to a lens and never force a lens on to a camera! If something doesn’t fit, take a few measurements and find out why it doesn’t.