Originally posted by ramshot My DA 18-55 and DA 50-200 do not do this. They stop when they reach both ends of the focusing range. My brother has the Canon 28-135 with the in lens motor and his focus ring turns past both ends of the focusing range also.
Maybe we're talking about two different things then. However, both lenses you mentioned have the quick shift mechanism that allows the lens to be manually adjusted. I know because I've owned both lenses. The only DA lens that doesn't have it is the 18-250 since it's a rebadged Tamron.
Sorry to hear about your lens hood trouble. My 50-135 is partially broken like this (I think it came from Beach or Berger Bros.). I think one of the catches is broken, but it stays on okay. I considered sending it back, but decided to just keep it. Adorama is a standup place. They should make it right for you.