Continuing from my Focus Screen and Sensor Cleaning article which I had written when I had my EOS 5D, I saw an opportunity to follow it up with a more thorough post when a friend noticed a spot in the viewfinder. Having risked it all before on my EOS 20D, 5D and the 5D MkII I said I would take a look the next time he’s in town. So the day came and I knowing that he’s hands-on enough when it comes to small PC-related tasks such as handling screw drivers, I threw the ball right back at him and had him tackle the problem himself. It was a great learning experience for him and at the same time allowed me to document the steps we took to complete the job. I’ve divided this post into two practical parts.
Part 1: Removing (or changing) the Focusing Screen
This step guides you to quickly examine if the dust or grime is merely on the Focusing Screen. After removal of the focusing screen and blowing both sides, reinstall the screen to check if dust disappears. If satisfied then Phase 2 isn’t necessary. Follow the same steps if you want to swap out the original focusing screen with a new one such as the Canon EG-D (Grid) Focusing Screen.
Instructions on Canon Focusing Screen kit reads … “Never touch the screen with your fingers or hold the screen in your hand. If the screen becomes smudged with a fingerprint or a foreign substance, the smudge will be very difficult to remove. Also be careful not to smudge the mirror or other parts of the camera when changing the focusing screen.”
Part 2: Removing the Metal Shims and Superimposed Display Screen
If however after completion of Phase 1 and you still see spots on the viewfinder, proceed as follows:
Disclaimer: The information contained in this website is for general information purposes only. No representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect my cleaning method or the information, products, services, or related graphics contained herein are made for any purpose. Any reliance you place on such information is therefore strictly at your own risk.
If this article has helped you, please consider making a small donation.
All contributions are gratefully accepted. Thank you very much!