Sun 09-Dec-12 09:48 PM | edited Sun 09-Dec-12 09:51 PM by kentak
Regarding the risks of cleaning--
It's my understanding that the likelihood of damage to the filter over the sensor is quite small providing reasonable care and proper technique is used. I think I remember learning that some pro photogs, like Moose Peterson, clean their sensors after every day's photo session. I'm sure they would not do so if such a practice would cause damage visible in their photos.
My own technique is to use a bulb blower. If significant spots remain, I do a wet cleaning with Sensor Swabs and Eclipse fluid. I go easy on the fluid so as not to leave streaks. I swipe in one direction, rotate the swab, and swipe again in the same direction. I haven't tried any sensor brushes yet, as it seems they would be more likely to introduce dust or push it around. Maybe others have a different view.
I'm not yet convinced a sensor loupe is a worthwhile investment, as taking a test shot will show whether or not visible dust has been removed. I'm willing to be convinced otherwise, however.