Canon EF-S Focusing Screen for Canon EOS 40D Digital SLR Camera
by Canon Cameras US
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Our Price: $39.95
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Category: Digital Camera
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Digital Photo Product Details
Manufacturer: Canon Cameras USModel: 2379B001
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Digital Cameras Photo Reviews of Canon EF-S Focusing Screen for Canon EOS 40D Digital SLR Camera
Customer Review: More benefits than just manual focus
Summary: 5 Stars
I adapt Contax lenses to my 60D, and when using them with the Ef-A screen, not only was focus difficult to acquire, but metering was extremely irritating: Photos would overexpose at apertures faster than f/2.8 and underexpose at apertures slower than f/4. After switching the screens (an easy process), metering was perfectly consistent from f/2 to f/22, only overexposing a third of a stop at f/1.4.
For anyone shooting with adapted lenses, I cannot more highly recommend this.
Note that this screen can only display the depth of field of about an f/1.8 lens, and the visible bokeh appears as a hexagon at apertures larger than f/2. It's not a problem for focusing an f/1.4 lens, because images shimmer slightly when barely out of focus, almost like microprisms, but you will get more blur than what you see at f/1.4. In addition, for all lenses, the defocus blur isn't evenly lit, but instead speckled. Not a problem, per se, but it isn't exactly pleasing to look at.
Description of Canon EF-S Focusing Screen for Canon EOS 40D Digital SLR Camera
Exclusively for the EOS 40D, this focus screen is optimized for wide-aperture lenses from f/1.8 to f/2.8. Areas that are slightly out of focus appear more out of focus, making it easier to tell when focus is right-on. Ideal for users who frequently manually-focus in dim light with fast lenses.Adapters
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