I have never seen this before.

[Chuck A]

http://cgi.ebay.com/Leica-90mm-f2-5...1QQihZ017QQcategoryZ30077QQrdZ1QQcmdZViewItem

Anybody know what this is? I have never seen this before.

 

[FrankS]

I think it's a projector lens.

 

[jonasv]

yep, projector lens for a leitz pradovit.

 

[Chuck A]

Ok, got it. thanks.