Componon-S lenses are my favorite lenses for enlargements, have used them almost exclusively for 5 years now (practically the blink of an eye compared to some other members here, but still enough time to form a valid opinion on them I would think), on both a Chromega DII 4x5, a Beseler 45M, and a Saunders 4550XLG. In fact, the only other enlarging lenses I use are a 105mm Nikon EL for my 6x7 and 6x9 negs, and the Focotar 40/2.8 on my V35. I have both the 50/2.8, 80/4, and 80/5.6, with the 80/4 being the most frequently used for both 35mm and 6x6 negs. Great lenses.