What is the difference between a 135mm and 150mm lense? I have found a Nikon 13 5 for $180.00. I have not been able to find a 150mm Nikon for less than $300.00 . I have found a lot of Raptar 162mm for around$50.00, are they any good? What other 150mm enlarger lense would be a good one in the $200/$300 range? When pr inting only a part of the negative would a 50mm or an 80mm be best? Dose raisin g the cold light do the same thing to print only a section of the negative?

Tim............