Which focal length for Large Format Enlarger

[Mpunktmayer]

The answer is simple: I sold an LPL7450 as an Large Format Enlarger. After selling the Buyer was unhappy because there was a 50mm lense mounted.
This lense is not for Large Format Enlarging and thats why I have to buy a 135/150mm lense for him. This is also the reason why I look for an cheap solution and why I'm fixded on M39.
I also looked for an M50 Lense Board but the price of 60 EUR is naughty for a piece of metal

[Michael S]

The 240mm Nikkor works well with 8"x10" negatives, but I also use it when enlarging 4"x5" negs so that I can work within the "sweet spot" of the lens. If I have to make a bigger print, say 20"x24", I utilize the 180mm Rodenstock (which is a very sharp lens).