Originally posted by Louicio It is a bit sticky and the foam takes a long time to bounce back after being pressed flat. Does it need changing or is it supposed to be like this?
Yes the foam should be replaced soon. If you keep up activating the shutter at this point, small bits of foam will get stuck on the mirror and some will be tossed onto the focus screen which will be impossible to clean without damage to the mirror or screen.
The good news is it is very cheap to replace & you can do it yourself.