Well, I was out getting ready to shoot a local WPGA Starter tourney and I had remembered that there was a dust colony on my camera.. so large it was visible at 2.8. So I had just purchased some Eclipse cleaning fluid, so out it came and a swab. Funny thing, it left something on the sensor.. try again... Still there? WTF? OK.. pop open again and notice, it has TAKEN THE COATING OFF THE GLASS! Holy crap! This NEVER happened before and I've cleaned my camera tons with eclipse fluid over the 3 years I've owned it. Well, needless to say, I've found out you are now supposed to use Eclipse 2 fluid, not Eclipse.

So, learn from my $170 mistake (the cost to replace the low pass filter) Don't use Eclipse, use Eclipse 2 fluid or send it in if you are a CPS member.