I almost never had any need to use this lens on 11x14 and maybe used my 11x14 once a year if thet often. I hated the beast. A Sinar Norma was my tool of choice. I used the 480mm Apo-Ronar for Magazine illustration, Still Life, Advertising and scads of covers for outdoor magazines. Mostly 8x10 and some 4x5 Ekatchrome. Out of all the lenses I had it and my Apo-Lanthars were my favorites, but nothing delivered the color quality and subtle shadow detail the way the Apo-Ronar did without fail. That lens is a jewel.