Canon Rebel T1i + EF-S 18-55mm IS 3818B0043 User Manual (en)

Canon CMOS Sensor
Taking advantage of its own proprietary technolo-
gies, Canon develops and produces its own CMOS
sensors. Unlike CCD sensors, CMOS sensors convert
and amplify signals before they are transferred to
the image processor, enabling them to produce
exceptionally clean image data and reduce power
consumption by as much as 90%. Data transfer
speeds are increased by using multi-channel signal
paths that dramatically improve the camera’s
responsiveness. Canon’s CMOS sensors incorporate
a unique on-chip noise reduction technology to
deal with both fixed pattern and random noise.
In addition, a multilayer low-pass filter is placed
in front of the sensor to isolate false colors that
the sensor may detect. Then, Canon's own 
Image Processor processes the image to help
eliminate those colors while retaining full detail.
CMOS sensors can also be fabricated to full-frame
35mm dimensions, an important consideration
for photographers who wish to use their lenses
without a conversion factor. Canon’s CMOS
sensors deliver outstanding resolution and signal
purity, making them ideal for the most critical
photo or video applications.
Full-Frame Canon CMOS Sensor
The Canon-manufactured full-frame
CMOS sensor delivers professional
performance with digital convenience. EOS Digital
SLR cameras with full-frame sensors, found on
the EOS-1Ds Mark III and EOS 5D Mark II, do not
require a focal length conversion factor common
to other digital SLR cameras on the market.
Instead, they deliver the same angle-of-view as
35mm film cameras, so the working distance to
the subject, with a given lens, is the same as it
would be on film. Since you can use EF lenses
on either 35mm film cameras or Canon Digital
SLR cameras with the same results, the switch
from film to digital is truly seamless. Full-frame
sensors provide greater control over depth-of-
field, which helps to create beautiful background
blur, perfect for portraits. The large sensor area
also helps to enable a marked reduction in
noise levels at all ISO values. When combined
with high resolution and smooth gradation from
highlights to shadows, Canon digital SLR cameras
with full-frame sensors produce images that rival
those taken with professional medium-format
and large-format film cameras. For maximum
control and dependable performance, the choice
is simple—Canon full-frame Digital SLR cameras.
Effective Light-gathering
The EOS-1Ds Mark III and 5D Mark II sensors have
21.1 effective megapixels and the EOS-1D Mark IV
has 16.1 effective megapixels. Individual pixel size
on the EOS-1Ds Mark III’s and 5D Mark II’s sensors
are 6.4μm, and the EOS-1D Mark IV’s sensor is
5.7μm. By optimizing the gap between the on-chip
microlenses and improving the fill factor (photo-
diode area divided by total pixel size) of each pixel,
light-gathering efficiency has been improved.
EOS-1Ds Mark III Full-Frame CMOS Sensor (actual size)
When using the same lens with different cameras, the
angle-of-view varies depending on the sensor size.
4 /
III Image
Developed to maximize performance
between capturing and recording stages
of digital photography, the DIGIC 4 and DIGIC III
Image Processors by Canon use advanced signal
processing technologies to dramatically enhance
image quality and deliver a more intuitive,
responsive camera. The DIGIC 4/III Image
Processors work in concert with Canon CMOS
sensors to achieve even higher levels of perform-
ance, with high-end EOS cameras incorporating
Dual DIGIC 4 Image Processors. Signal process-
ing algorithms work with the multi-channel signal
from the sensor and the high-speed DDR-SDRAM
buffer to deliver significantly improved camera
response. Power consumption has been further
reduced for even longer battery life. Color repro-
duction, noise reduction in low light situations
and reproduction of fine detail are all signifi-
cantly improved. In addition, the latest Dual
DIGIC 4 Image Processors speed up all opera-
tions such that a number of processor intensive
features are possible. Canon technologies like
Face Detection Live mode, Full HD and HD movie
recording, Lens Peripheral Illumination
Correction and Auto Lighting Optimizer are all
possible thanks to the power afforded by the
amazing DIGIC Image Processor.
Extensive ISO Range*
EOS SLR cameras feature an extensive ISO range
for greater flexibility in diverse photographic
situations. The EOS-1D Mark IV features the
breathtaking ISO range of ISO 100-12800
(L:50, H1: 25600, H2: 51200, H3: 102400)!
Even at higher ISO settings where one might
expect to see a higher degree of noise, the
renowned Canon CMOS sensor and noise
reduction system work to ensure superb image
quality. Accordingly, even the most critical
photographers can use EOS SLR cameras with
confidence, no matter the light.
Advanced 14-bit A/D Conversion 
EOS Digital SLR cameras employ 14-bit converters
to process the output of the imaging sensor.
Compared to the 12-bit converters used in most
digital cameras, the Canon design helps ensure
smoother tonal transitions, more natural grada-
tions, and superb color fidelity. RAW images are
recorded at 14 bits so that processed 16-bit TIFF
images contain the full range of tonal values
captured by the sensor.
Highlight Tone Priority
Loss of highlight
detail is one of the
greatest concerns for
photographers shoot-
ing digitally in brightly
lit and contrasty situa-
tions. Canon’s Highlight
Tone Priority function
calculates the exposure
to expand the image’s
dynamic range so that
more detail is preserved in highlights. This
renders a more continuous tone image without
blown highlights, and helps to save time in
postprocessing for highlight retrieval.
Lens Peripheral Illumination Correction
Another feature available in Canon’s newest EOS
Digital cameras is Canon’s Lens Peripheral
Illumination Correction feature. Taking into account
the lens in use, this feature automatically brightens
the light level at the four corners of the composition
where light falloff may have occurred. Peripheral
illumination characteristics and correction data
are detected automatically on a number of Canon
lenses and can be entered manually through
Canon’s EOS utility software. This function can
be applied when shooting to JPEG images, and in
post-processing with RAW images.
Auto Lighting Optimizer
One of Canon’s newest technologies, the Auto
Lighting Optimizer, automatically corrects image
exposure to help ensure accurate brightness
and contrast. It can actually brighten areas of
the composition while maintaining highlight
details and accurate exposure in others, or
darken areas of composition while maintaining
brightness and shadow details in others. This
remarkable feature is available as both an
automatic feature in Full Auto and Creative Auto
shooting modes, and can be used and fine-tuned
in other modes. The Canon Auto Lighting
Optimizer ensures beautifully exposed images
that require little to no post-production work.
*Standard output sensitivity. Recommended exposure index.
High ISO – Whether shooting stills or video, Canon EOS SLR cameras capture silky-smooth low-noise images that are sharp
with a wide dynamic range of color and tone, even at high ISO speeds.
Taken with the EOS-1D Mark IV.
Highlight Tone Priority: ON
Highlight Tone Priority: OFF
Auto Lighting Optimizer OFF
Auto Lighting Optimizer ON
Full-Frame (1.0x)
Full-Frame (1.0x)
APS-C (1.6x)
APS-C (1.6x)
APS-H (1.3x)
APS-H (1.3x)
©Clay Blackmore