I wanted to start printing from my 6x6 negatives and, for such occasion, I bought a simple Rodenstock-Trinar 75mm.
On e[...], the item's description says "standard mount".
Isn't the standard mount 39x1?
When I bought my Meopta Opemus 6, I found that the 50mm lens of my older Durst F30 would fit on the new enlarger but this lens it's smaller. See photos attached.
What else should I buy?