※Please be sure to read the profile. Purchase constitutes agreement with the profile contents.※ This item is not subject to price reduction. Comments requesting price reductions will be deleted. This is a K&F mount adapter, well-known among old lens enthusiasts. It allows the use of M42 mount lenses (old lenses) on Canon RF mount cameras. It supports the push-pin mechanism. Due to the step in the screw attachment part, it also supports infinity focus for some Fujinon lenses and Mamiya SX lenses. Since there are no electronic contacts, focus, exposure, etc., are all manual operations. The inside of the mount adapter has been treated to prevent internal reflections. Infinity focus is supported. This is a new item. The originally included plastic storage case is not included. Please note that it will be opened before shipping to check for initial defects and to test the lens and camera attachment. A new lens cloth (15 x 15 cm) will be included as a bonus. The mount adapter is not a genuine product of the manufacturer. Please research thoroughly before purchasing, as there may be lenses that are not compatible. If you have any questions, please contact us via the comments section. Free shipping, shipped via Yu-Packet Post Mini. A plastic storage case is not included. It will be wrapped in bubble wrap and shipped in a Yu-Packet Post Mini envelope. Same-day shipping is generally not possible. Also, shipping is not available on Saturdays, Sundays, and holidays. Please purchase with ample time for arrival.