Tom,

My widest lens is a 90mm. Furthermore, it's my least favorite. My most often used lens tends to be my 30mm f9 nikkor. Toho makes an eccentric lens board that is supposed to make life easier; however, I would say that 90mm is likely the widest lens that's useable on the toho. However, I love the sub three pound weight of the toho. Yes, I've made it lighter by following kerry thalmann's suggestions.