Hey everyone, I've been looking online and after finding a few bits of information I'm still stumped.
I know it's a 150mm, for a 12x16cm plate - but this lens has a focusing helicoid. I cannot find anything about this. Worse yet - I can't get it to focus. I then took the lens apart, removed grease and re-lubricated, re-assembled properly and still no luck.
Why does it have a helicoid and how do I get this thing to work?!
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