I wish a camera had another glass lense between the body and the lense to keep dust out of the body all together. It really is a pain to get that body cleaned out. Almost to the point I never want to do a lense change again. Just have 2 cameras..
Probably not a good idea to use your breath to clean a camera lens glass as it can cause condensation to build up on the inside if the lens is not well sealed and also trigger fungus
That sensor loupe can not focus on both the mirror and the sensor. I think it's designed for the sensor. Breathing on a lens is ok if you must do it in the field.
