There's a lens going cheap on ebay because there's some internal haze. Aparently it doesn't effect the picture quality It's going for about 1/3 of the normal price (it's a second hand consumer film lens that's normally 75 quid or so that's reasonably well regarded for the price) What is haze, what causes it, can I get rid of it and does it impact picture quality? I've read a bit on the web and some people note no apparent effect, others saying it does. What say urban? Worth a punt?