All my issues with dust on the sensor and in the viewfinder have come about from using a blower to try and blow the dust away. Dust particles on the focusing screen,were actually forced deeper into the pentaprism, rather than helping, the blower moved the dust onto the super impose screen (above the 5dm2 focusing screen).
To remove this dust (I know it doens't effect the images, but it is just annoying in the viewfinder) I had to follow the procedures outlined by Shimworld to remove the dust from the SI screen.
http://shimworld.wordpress.com …-the-5d-mk-ii-viewfinder/![]()
What I found to be of great use was the Arctic Butterfly, I've swept my sensor, mirror, focusing screen, Super Impose screen very lightly without any detrimental effects or visible scratches. It managed to remove all the dust particles from all the important viewing surfaces in the mirror box.
It pays to have the different brushes for the Arctic Butterfly, the angled head on the mirror brush allows you to get into the tight angles which is perfect for the mirror, focusing screen and the SI screen. Using different brushes prevents you from contaminating the sensor, as this has one exclusive brush. Also if you get other brushes don't forget the required adaptor to fit them to the Arctic Butterfly.
The brush actually picks up a lot of the dust and is better than blowing, it appears the static charge attracts the dust and allows you to remove it.It's easy to clean the brushes by spinning them and if you need to wash them you can use 100% isopropyl alcohol.
When it comes to the sensor, a sensor loupe is invaluable to spot the dust particles and the Arctic Butterfly removes 99% of the particles on the sensor.
For wet cleaning to remove welded dust I can only recommend Visible Dust sensor clean solution and their differently sized Ultra MXD swabs. (get the right one for your sensor size). The trick is to only take one pass over the sensor, then turn over the swab and go back the other way, that is only a total of 2 passes. I tried Eclipse E2, but the solution did not dry correctly and left streaks all over the sensor. I did not have the same problems with VD Sensor clean and the MXD swabs did not shed fibres, so I can recommend this product set.
With these tools it's easy to remove dust from your sensor and mirror box, without having to send the camera body in for a service etc. Try not to use a blower inside the camera body as this adds more dust to the equation and blows it deeper inside.




