This Canon R-F-3 2428A001 cap screws onto your EOS camera body to protect the inside of your camera. The cap also attaches to the front of EF 12, EF 12 II, EF 25 and EF 25 II extension tubes for versatile use.
Plus EF 12, EF 12 II, EF 25 and EF 25 II extension tubes for use with your existing model.
Protects the inside of your camera against dust and damage.
Makes it easy to install.