I've been wading through websites and am getting ambiguous answers. Can anyone tell me the correct Canon lens hood for the older [original and now discontinued] EF Canon 50mm f/1.8 lens - often known as the Mark One - to distinguish it from the Mk II, the current f/1.8 model? It appears that the 50mmf/1.8 Mk2 takes the ES62AD the 50mmf/1.4 takes the ES71/2 So what about the 50mmf/1.8 Mk1? If its "proper" lens hood is no longer available, what's the best current alternative?