The 8x10 equivalent to a 90mm on 4x5 is 180mm--considerably shorter than a 240mm. That being said, I love the 240mm focal length on 8x10--it's a nice moderate wideangle. I have the 240mm Symmar-S and it's a pleasure to use--a big bright plasmat. The biggest drawback is the limited coverage that doesn't allow much movement. I think I'd look for a lens with more coverage.