Greetings! I recently acquired an Omega D-II and it didnt come with any lenses but it came with 2 lens boards, one the flat one and one 4" cone. I have a 50mm lens for printing 35mm now and it just barely works for printing a 6x6 but with very little working room (about 6 inches) and it needs a big stack of books to set the easel on to even bring the image high enough to fit onto an 8"x8" print. I also plan to to enlarge 4"x5" sometime soon. I was wondering how the working conditions and possibility of using a 150mm lens (with either the cone, or flat lens board) would be for enlarging both 4x5 and medium format negs? I would like to keep the 50mm lens for only 35mm and maybe use the 150 for medium format and 4x5. If I were to use it im guesing id have to push my enlarger unit really high, I normally wouldnt print any larger than 8x10, rarely 11x14... Would a 150mm lens be acceptable for printing medium format (up to 6x7) and 4x5?