Excerpt: For some reason, my 18-55mm kit lens didn't come with a rear cap. As soon as I realized this, I knew I'd need a rear cap because I soon began acquiring additional lenses and the kit lens fell out of daily use.
Excerpt: I lost the original cap for my sony lens so I decided to get a sony cap made for sony by sony. If fits like the one that came with the lens and serves the purpose of keeping the dust out. I would recommend this product to anyone.