IX . CONTROLS AND DISPLAY
43
The basic configuration and performance of the
SI (superimposed) display optics are the same as
those of the EOS-1D Mark II
N
. However, to match
the improved eyepiece optics, the SI LCD and SI
lens 2 have been changed.
The Ec-C IV focusing screen is a Laser Matte unit whose molding method has been
improved over the previous Ec-C III focusing screen's. It makes it easier to focus and
provides natural-looking background blur (bokeh). It is also brighter and less grainy,
making it a very well-balanced focusing screen. With the improved molding method,
image transfer is better. The dispersion characteristic is improved, and the screen is
brighter with minimal flare. The fresnel lens area is especially improved for image trans-
fer, increasing the peripheral brightness and making the screen look clearer overall.
Compared to the EOS-1D Mark II
N
's
Ec-C III standard focusing screen, the
Ec-C IV is brighter, less grainy, and
better balanced. The EOS-1D Mark III
is compatible with all Ec focusing screens used by EOS-1 series cameras.
Since the eyepiece frame now has a different shape to accommo-
date the bigger eyepiece lens, viewfinder accessories dedicated
to the EOS-1D Mark III have been developed at the same time:
Eyecup Eg, Dioptric Adjustment Lenses Eg (7 types: -4, -3, -2, 0,
+1, +2, +3), and Anti-fog Eyepiece Eg. Note that the old EOS-1
viewfinder accessories Eyecup Ec-II, Rubber Frame Ec, and Anti-fog Eyepiece Ec are not
interchangeable with the Eg-series accessories. The newly-developed, standard Eyecup
Eg has an improved mount for attaching it to the eyepiece. It is now less prone to detach
inadvertently compared to the old eyecup.
SI-LCD
LED emitting lens
SI-LED
SI dichroic mirror
45 main reflex mirror
Laser Matte surface
Condenser lens
Eyepiece lens 1
Eyepiece lens 2
Eyepiece lens 3
Eyepiece lens 4
Metering sensor
SI mirror
SI lens 1
SI lens 2
Metering lens
Pentaprism
Focusing screen
SI lens 2
Dichroic mirror
SI lens 1
SI LCD
LED emitting lens
SI LED
Viewfinder Optics
EOS-1D Mark III
EOS-1D Mark II N
Eyecup Eg
Major Viewfinder Specifications
Item
EOS-1D Mark III
EOS-1D Mark II
N
Coverage [Approx. %]
100
Magnification
0.76
0.72
Viewing angle [°]
30
28.2
Eye point [Approx. mm]
20
Dioptric adjustment [dpt]
-3 – +1
