Mystery Item

10/13/2010 0 Comments A+ a-

We need your help! You see, we have this lens kit...

It's made by Hugo Meyer and Co., and comes with a Plasmat lens, focal length tube adapters and masks.

And then there's this one part in it that we are unsure of what it is, and can't seem to find any information on it. We are hoping someone out there reading can help...
What is this piece?
If you know, please email us! We appreciate your help.