This is an extender specifically for EF lenses. I purchased it new, but I haven't had a chance to use it because I switched to the EOS-R system. The electronic contacts are in good condition, and there are no scratches or stains that would affect shooting. However, please be aware that this is a used item (please check the photos). Thank you for your consideration. *Opened for operational check. Stored in a dehumidified cabinet. Non-smoker. Available for immediate purchase.*