Canon EOS 5D Mark II - EOS 5D Mark II 21.1MP Full Frame CMOS Digital SLR Camera, Service Manual

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Appendix
2
2．SUPER PRECISION MATTE CHARACTERISTICS
●Easier to catch the point of focus
As shown in Fig. 004, compared with other focusing screens, the Super Precision Matte
features a very quick drop in contrast (blurring) when you miss (defocus) the point of focus.
You see a very blurry image even when the focus is only slightly off. This makes it very easy
to see the point of focus.
As shown in Fig. 005 and 006, the power of the microlenses on the matte surface is much
stronger than that of the standard Precision Matte. The image formed on the matte surface is
dispersed very quickly even with a slight amount of defocus.
Defocus amount [mm]
10:8
10:0
10:5
0 0.25 0.5 -0.75 +0.75 0.5 0.25
C
on
tra
st
New Laser Matte
Standard Precision Matte
Laser Matte
Super Precision Matte
＊ The horizontal axis indicates the defocus amount, with the point of focus of 0.0
mm at the center. On the vertical axis, you can see how the contrast amount (degree
of blur) changes with the defocus amount.
The sharper the peak around the point of focus, the more sudden the blur occurs
and at a higher amount. The flatter the peak, the more gradual and less the blur
will be.
Fig. 004 Contrast characteristics for the defocus
Fig. 005 Super Precision Matte
Fig. 006 Standard Precision Matte