Originally posted by Not a Number I've cleaned focusing screens in an ultrasonic cleaner - lukewarm water with a drop of detergent in it.
Thanks for tutorials. I thought about cleaning with water, but when microfiber did good job, I decided to leave it that way.
Quote: If your focus screen, pentaprism and mirror are clouding up either something is out gassing in the camera - lubricants, light seals or electronic components are the most likely suspects.Another source can be the materials used in camera bags or a polluted or smoky environment.
The background is unknown. However, I know that in couple of years any glass, and any mirror will build up some cloudy residue if exposed to the open air or being inside unsealed box.
It must be the same with screens, plus, they are too close to human contact (sweat, oils). The camera is 6years old, and I doubt that screen has been ever cleaned.
The difference in clarity is amazing. If I knew, I would clean the screen long time ago.