I have used Componon and Componon S lenses and the S is better for big enlargements. I have used a 360 mm Componon S lens enlarging 8 x 10 negatives up to 16' and it was sharper and cleaner than any of my other lenses for that degree of enlargement without using filters. I have the head of a very expensive camera/enlarger designed for up to 10x magnification and it was designed around a 360mm Componon S.