What is this Mizar branded converter-like thing?

by Saaru Lindestøkke   Last Updated January 13, 2018 01:18 AM

I found a cylindrical thing in my photo gear box and I am not sure (anymore) what this is. It seems some kind of converter, as it has a different thread diameter on each side.

What is it, and what's it used for?

The ring lying next to it has a letter P on it, and it can replace the ring on the right hand side of the Mizar tube. enter image description here

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