Hey all, when I got my used 40D a few weeks ago, one of the plastic clips inside the eyecup was cracked which allowed the eyecup to easily slip out. It seems that I've lost the eyepiece somewhere and need to get a replacement. I was hoping it would be a simple choice, but it seems there are different varieties. Does anyone have any suggestions or recommendations for a replacement? They all seem to be inexpensive, so are some better than others? Thanks!