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Interchangeable focusing screens are a new and significant feature of the EOS 40D. The Ef-A Standard Precision focusing screen have a fresnel lens area and are produced by a new molding method (first used on the EOS-1D Mark III's focusing screen Ec-C IV) that provides excellent transfer characteristics. Consequently, even the Standard Precision Matte screen offers improved performance.
Technical details
Compatibility:
Canon EOS 40D/50D/60D/60Da/70D