Put it on my 50mm and it works great. It comes in a two-piece assembly. The default settings use a 58mm thread as the main engagement. My lens uses a 52mm thread, so I don't use a 58mm thread at all. However, the product only comes with a 58mm cap. I had to buy a separate 52mm cover but at least it was metal. The supplied lid is made of plastic. In fact, both covers are made of plastic. The overall quality and finish is very good.
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