Thanks again Kris. Just bought a macro tube off e-bay. It's in the bin! I had real problems with it jamming on one of my lenses. It seemed very poorly made so couldn't trust it. I'll look out for a 135mm to add to the collection. I've gone for A lenses so far reasoning that they would be better as they were newer designs. I'm sure you'll put me right if my thinking on this was wrong.