Metal mount adapter. Camera mount: Pentax K. Lens mount: M42

Metal mount adapter. Camera mount: Canon EF. Lens mount: Olympus OM

Bayonet adapter for attaching an EF/EF-S mount lens to a camera with a Sony E mount

Canon EF 16-35mm f/4L IS USM

AF-S NIKKOR 28-300mm f/3.5-5.6G ED VR

Metal rear lens mount protection ring for Canon EF lenses. Can be used with filters for safe close up