I just installed the procrop screen in the 30D. The screen comes with crop lines (4x5). It is awesome.
Installation was very simple; 5 minutes at the most. I took the opportunity and clean with the rocket blower. I must say that there are no spots that I can see through the viewfinder. There were before, since day 1 when I got the camera new in 2007.
Highly recommended accessory for your camera.
This is the link if you are interested:
http://www.roblewisphotography.com/moreinfo.htm
The usual disclaimer applies; I am just a satisfied costumer,
Regards,
Simon
