As with every method, I've seen good and bad things about it. Whatever the case, I'm pretty wary about adhering scotch tape to the low-pass filter. I saw an idea to use PDA screen protectors mentioned on a dpreview forum thread. I use Screenguardz for my PDA and my D40's LCD screen. They work very well and I like them particularly because they use no adhesive. Instead, they use a small amount of static to cling to the screen (only the stick-on side is statically charged). Peeling them off once it's time for a replacement is completely effortless, yet they stick on very well. Additionally, I've noticed that the screen has a nice sheen and is completely dust-free after I've peeled one off. So, I cut one up, stuck it onto the reflex mirror, lightly adhered it with the eraser end of a pencil and then peeled it off. It worked very well. I haven't yet had the sensor cleaned because I don't want to pay a shop almost $100 to take all day to do it. So, I'm contemplating trying this method on the low-pass filter. Could a small amount of static electricity create any adverse effects?