Sigma question in two parts, sorry: Sometime in the early - mid 1990s I bought a Sigma 400mm Apo for use on a Canon EOS 10 a 35mm film camera (probably about the start of the EOS name). It's been in a cupboard for a long time. I dug it out yesterday and was alarmed to find that the coating on parts of the lens body was sticky and coming off like tar or Marmite. Apparently it is the zen coating and problem is known about. Exactly as in the image in this post I found when searching for the problem: http://www.fredmiranda.com/forum/topic/966731 Question 1: Does anyone know the best way to deal with this? I could try removing it with Meths, White Spirit or Nail varnish remover, but I thought I would ask advice. Question 2: If I rescued the lens from the sticky stuff is there any way of using this lens on (say) a possible future EOS 650D? Would this also apply to the two Canon kit zooms I also have?