5 of 5 people found the following review helpful
Extremely helpful focusing screen,
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This review is from: Canon EF-D Focusing Screen for Canon EOS 40D Digital SLR Camera (Camera)
I bought this screen primarily to help me line up the horizon in a straight line so I have less cropping and straightening to do in post processing. One thing I've really come to love about the gridlines is that it really helps me to follow the rule of thirds much more easily. Highly recommended.