The Pro Lens Mount Adapter Kit for Deckel-Mount Lens to Fujifilm G-Mount Camera from FotodioX includes two adapters, one of which allows a Deckel-mount lens to be used with a Canon EF or EF-S camera, while the other adapter allows a Canon EF or EF-S mount lens to be used on a Fujifilm G-mount camera. When combined, the two adapters allow a Deckel-mount lens to be used with a Fujifilm G-mount camera.

Together, as well as individually, these adapters are designed to support focusing to infinity. The FotodioX Pro Lens Mount Adapter for Deckel-Mount Lens to Canon EF or EF-S Mount Camera and FotodioX Pro Lens Mount Adapter for Canon EF or EF-S Lens to Fujifilm G-Mount Camera are constructed with brass. Both adapters also feature stainless-steel lens mounting rings to provide a durable, yet lightweight camera-to-lens or camera-to-adapter connection.

These adapters do not support electronic communication between an attached camera and lens. To control the amount of light that enters a Fujifilm G-mount camera when using this adapter kit, or a Canon EF or EF-S mount camera when using the compatible adapter and a Deckel-mount lens, an aperture-control ring is built into the Pro Lens Mount Adapter for Deckel-Mount lens to Canon EF or EF-S Mount Camera. This control ring couples with the lens's aperture mechanism so that adjustments to brightness as well as depth-of-field can be made. It features clicking stop adjustments that can be set to clickless to help prevent unwanted noise from being recorded while capturing video with sound.

When removed from a compatible Canon camera, the aperture diaphragm on a Canon EF or EF-S mount lens is designed to open to its widest setting. A Canon EF or EF-S mount lens may be effectively used with its aperture diaphragm fully open along with the Pro Lens Mount Adapter for Canon EF or EF-S Mount Lens to Fujifilm G-Mount Camera. Otherwise, an aperture value on a Canon EF or EF-S mount lens may be set by first placing the lens on a Canon EOS camera and then pressing the camera's depth of field preview button while removing the lens prior to placing it on the adapter.