I have probably been silly. Persuaded Ffordes (UK) to sell me a new chrome Summicron F2 for the price of a black one. (I have spent thousands with them in recent years, so they probably wanted to keep me happy!). This is my only chroms lens, except for the 5cm Summitar for my IIIg, which doesn't really count. However, I'm alarmed. I have black 24mm, 35mm, 90mm and 135mm lenses. The results are fantastic, but the chrome lens feels so much better, though it is quite heavy. The black feels insubstantial. Should I change all the lenses, and will anyone give me the money to do it? Rather frivolous post - sorry!