IV. DISCUSSION OFNEW AND IMPROVED FEATURES 20
The dimensions(W x H x D) of the EOS-1Ds Mark III are: 156 x 159.6 x79.9mm/6.1 x
6.3 x3.1 in. It is 3mm taller than the EOS-1D Mark III. The body-only weight is approxi-
mately42.7 oz./ 1,210g, approximately 1.9 oz./55g heavier than the EOS-1D Mark III
but0.18 oz./5g less than a body-only EOS-1Ds Mark II. The difference in this case
becomesmore pronounced when the respective batteries are added in: 48.9 oz./1,385g
for the EOS-1DsMark II vs. 54.9 oz./
1,555g for the MarkII, a difference of
approximately6 oz./170g.
Water- and dust-resistantconstruction is
the same asthe tight and thorough seal-
ing ofthe EOS-1D Mark III.
Exceptfor the 35mm full-frame CMOS sen-
sor, large glasspentaprism, and full-frame
SelfCleaning Sensor Unit, the internal com-
ponents(including the shutter and the
shutter-release mechanism) are the same
asthose of the EOS-1D Mark III.
The basicelectronic components are the
same asthose of the EOS-1D Mark III.
However, certain boardshave been optimized
for the 35mm full-frame CMOSsensor. For
example, due tothe larger circuit, the Self
Cleaning Sensor Unitboard has been split into two boards.
Allparts comply with the RoHS (Restriction of the Use of Certain Hazardous Substances
in Electricaland Electronic Equipment) Directive.
Ifthere is a small noise when the camera is shaken, it is t he sound of the ball bearin gs in
the camera orientation detection unit.
Location ofMajor Water-resistantMeasures
* The shutter unit is counted as 1 part.
* The DC/DC converter is counted as 1 part.
* The E-ring is counted as a washer.
* The official total excludes the screws and washers.
Item 1DsMk II1DsMk III
Optics
Mechanical parts
Electrical parts
Circuit boards
Lead wires
Total (Official)
Screws and washers
Total
35
674
1557
41
162
2323
349
2672
30
628
1479
43
22
2202
311
2513
T
PartsCount
SI lens 2
Eyepiece lens 4
Eyepiece lens 3
Eyepiece lens 1
Eyepiece lens 2
H-LCD
H-LCD prism
Image sensor
Low-pass filter
Secondary mirror
LCD monitor
AF sensor
Rear LCD panel
Lithium-ion battery
Secondary
image-forming lens
Infrared-absorption
filter
Fixed aperture
Fully-reflective
mirror
45 main reflex
mirror
Focusing
screen
Laser Matte
surface
Condenser lens
Pentaprism
Metering lens
SI lens 1 Metering sensor
SI mirror SI prism 1
SI prism 2
CrossSection at Center