Infinity focus depends on register distance and adapter thickness as well as lens condition. A physically attached lens can still focus short of infinity.
Make the exact-model decision
Check the lens and adapter's specified mounts, then test distant focus before relying on the setup. Record the adapter model and read its direction as lens side to body side. Check the maker’s excluded lenses before attaching anything.
A manufacturer example
Fujifilm’s M Mount Adapter page describes M-to-X direction, a compatibility gauge and camera settings such as Shoot Without Lens. Use the linked page for its stated model and revision; a different model may need a different support document.
Where to draw the line
Electronic contacts, a manual ring and a glass-containing adapter solve different problems. Avoid extrapolating from one adapter generation to another. If a source does not address the exact feature you need, record that feature as unknown rather than treating silence as support or incompatibility.
Your next step
Take the model code from the body or lens label, open the official source below, and compare its scope with the equipment you have. Then use the inspect directed adapters to organize what is known. Do not mount an item that resists or appears on a maker’s exclusion list.
Official sources and scope
Checked for this reference on October 30, 2026. Product firmware and support lists can change; inspect the current maker page for your exact revision.