can some one explain about this please?
- Thread starter Robbo
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- Ian
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Canon Focusing Screen EF-S - Exclusively for the EOS 40D and 50D, this focus screen is optimized for wide-aperture lenses from f/1.8 thru 2.8. Areas that are slightly out of focus appear more out of focus, making it easier to tell when focus is right-on. It is ideal for users who frequently manually focus in dim light with fast lenses.