Thanks jjphoto. Are APO lenses marked as such?
Not always, but often they are. Rodenstock and Schneider explicitly mark them as APO in the product names.
And yes, with a bit of looking around highend enlarger lenses can be rather cheap. I paid 80 euros for my APO-Rodagon 50mm. At that kind of prices there is very little to fuss over. (especially not compared to the price of good camera lenses....)
.....no manufacturer would forget to cover out explizite the "APO" corection of it's special lenses and they are ALL market by most expensive prices 
What may surprise you is that some of the less expensive lenses give great results. My favourite MF lens is a Minolta with Rodenstock for 35mm and LF. I must admit that I see little difference between the Nikon, Rodenstock and Schneider lenses that I have. The only thing I've had with some older lenses is focus shift when stopping the lens down plus the need to work at a smaller aperture. The Rodenstock 50mm works extremely well at f5.6. One other nice lens is a Durst (Schneider) 150mm that was picked up on ebay for a tenner.
