I have not used my Sigma SA 9 in a couple of months, when I perped it for a shoot tomorrow I found the view finder has a rose color tint, the mirror and focusing screen seem to clear, it is not in the lens, took the lens off, it is the viewfinder. I then check my SA 7 has the same tint, I have not used the SA 7 in over a year, both use the same viewfinder and are I assume the same age. Any ideas.