Speaking as a studio product photographer for over 35 years, I have Commercial Ektars in 8", 10", 12" and 14". I also have more modern lenses in these focal lengths such as Nikkor, Schneider, Rodenstock and Fuji. I use my "modern" lenses for location work and outside where the newer coatings help diminish lens flare, for the studio work I exclusively use the Ektars. Primarily on 4x5, used to use the 12 and 14" on 8x10. They have never let me down. In the last week I have exposed about 86 sheets of 4x5 Ektachrome EPP. The images are great, as always. The downside (but not for inside studio work with strobes) is the older shutters that are somewhat cantankerous. I know how to disassemble and clean these old Ilex/Acme shutters though, so I can keep mine running. For studio work with strobes, as long as the shutter has X-sync, and some sort of instantaneous shutter speed, I am good to go.