Canon EOS Digital Rebel XTi SLR Review
By Movable Type Admin
Camera Design and Features
The EOS Digital Rebel XTi shares its body design with its predecessor, the XT. The body is small and lightweight, with dimensions nearly identical to the diminutive Pentax *istDL and, at 18 ounces, weighting only 1.4 ounces more. The XTi's small size is a perfect fit for all but the largest hands, and its ergonomics are ideal, with a comfortable rubberized grip and controls that are both easy to reach and hard to accidentally actuate.
The body consists of a chassis made of stainless steel, and a mirror box made of high-
strength engineering plastic. The mirror box, to which the lens mount and image sensor are
attached, is fixed very securely to the chassis to obtain the same body strength as the
EOS 20D. This helps prevent the flange focal distance from changing due to the static
pressure of the attached lens.
As with the EOS Digital Rebel XT model, the EOS Digital Rebel XTi camera's top, front and rear
covers are made of special engineering plastic known for light weight, excellent strength
and electromagnetic shielding: ABS resin, polycarbonate resin, and polycarbonate mixed
with special conductive fibers. Both titanium silver and satin black body colors will be offered.
Canon's large-area CMOS (Complementary Metal Oxide Semiconductor) sensor captures images with exceptional clarity and tonal range, and offers the most pixels in its class. This APS-C size sensor (22.2 x 14.8mm) has the same 3:2 ratio as film cameras, enabling an effective angle of view that is 1.6x the normal EF Lens focal length. With an effective pixel resolution of 3,888 x 2,592, the EOS Digital Rebel XTi offers superb detail and clarity, even in large prints, and generates finished files that open at approximately 30MB in your image-editing software. On Canon's CMOS sensor, each pixel is captured with fine detail to create images of tremendous depth and resolution, ensuring enough information for even poster-sized prints.
Several engineering features account for the sensor's wide ISO range (100 to 1600), low
noise, high dynamic range, and low power consumption. The configuration of each
photo diode in each pixel has been optimized; detail processing has been improved,
and a greater portion of each pixel is now sensitive to light. The microlens array which
gathers light for the sensor has a new design, shared with the microlenses in the
EOS-1Ds Mark II, 1D Mark II and 30D that reduces the gaps between the lenses. This
narrow-gap array gathers light more efficiently and loses less light between the lenses.
Self Cleaning Sensor Unit
No matter how careful photographers may be to change lenses in dust free areas
and to keep their equipment as clean as possible, dust often ends up on their
cameras' sensors, creating distracting spots on recorded images. The Digital
Rebel XTi's integrated hardware and software solutions make trouble with dust
a thing of the past. The Digital Rebel XTi is the first digital EOS SLR camera
to feature this important technology: by ensuring the sensor is free of dust and
debris, the camera delivers a cleaner image.
To combat against stray dust that enters the camera and adheres to the image sensor during a lens change, the Digital Rebel XTi features an all-new, Canon-designed Self Cleaning Sensor Unit. The low pass filter cleans itself automatically with ultrasonic vibrations, removing dust from the sensor assembly.
Dust Delete Data Detection
Dust that has been missed by the Integrated Self Cleaning Sensor Unit can also be
erased with software included in Digital Photo Professional (DPP) Version 2.2. The
Digital Rebel XTi's imaging sensor is able to single out the dust particles on its
surface, then plots out their location coordinates within the image. This data is
transmitted along with the image, whether JPEG or RAW, and can be either manually
or automatically erased in Canon's DPP 2.2. This added software option ensures the
cleanest possible image, perfect for printing or archiving.
EF Lens Mount
The EOS Digital Rebel XTi uses a Canon EF lens mount (full electronic control type)
and accepts the over 60 available Canon EF lenses from 14mm ultra-wide-angle to
1200mm super-telephoto including the new EF-S type.
Available only in the Digital Rebel XTi kit, Canon's compact EF-S 18-55mm f/3.5-5.6 zoom lens approximates a 28-90mm zoom lens (in 35mm format). By reducing the distance from the rear of the lens to the imaging sensor and reducing the size of the image circle to accommodate the camera's imaging sensor size, the lens produces high image quality with superb resolution at all focal lengths. The lens is also smaller and lighter than conventional lenses because of the shorter backfocus distance.
Utilizing a 9-point autofocus system inherited from the 30D, the Digital Rebel XTi is capable of analyzing where a subject is -- even when it is off-center - and almost immediately bringing it into focus. It can also analyze subject movement and automatically select locking or tracking AF modes as needed. These features simplify the camera's operation and optimize its performance. The Digital Rebel XTi allows users to select locking or tracking AF modes independently, adding a new dimension of creative control. The DIGIC II chip actually help increase the speed of autofocus calculation and hence the responsiveness of the autofocus itself.
The Digital Rebel XTi has three user selectable autofocus modes: One-shot AF, AI Servo AF with focus prediction and AI Focus AF as well as manual focus. Going from autofocus (AF) to manual focus (MF) is accomplished by flipping a switch on the lens itself. The AF system is able to work down to 0.5EV at ISO 100.
The AF-assist beam is a series of stroboscopic flashes from the builtin flash or a near-IR
patterned LED with a compatible accessory Canon Speedlite. With the built-in flash, the
working range of the AF-assist beam is approximately 4 meters/13.1 feet at the center
and 3.5 meters/11.5 feet a the other 6 AF points. Firing stops when the focus detection
confirmation signal is detected.
E-TTL II Flash
The camera's high profile, built-in retractable flash unit makes taking pictures with well-balanced foreground and background exposures simple thanks to Canon's E-TTL II (Evaluative Through-The-Lens) flash exposure metering system. When shooting in the AUTO mode or the Basic Zone modes (except landscape, sports or no flash mode), the built in flash will automatically pop up and fire in low-light or back lit conditions. In other recording modes you press the release button to pop it up when needed. The flash provides coverage for an angle of view of a 17mm lens, and has a recycling time of only three seconds.
E-TTL II takes effect when the built-in flash or an accessory EX-series Speedlite is used. E-TTL II does not assume that the AF point in use covers the main subject. Instead, when the shutter button is pressed completely, ambient light is measured just before a pre-flash fires. For each metering zone, the ambient reading and the pre-flash reading are compared.
Areas having a large difference between ambient and pre-flash readings are selected
and analyzed. Extreme differences suggest a highly reflective or specular object; these
areas are eliminated from calculations, avoiding underexposure. When a lens
providing distance information is used, this data is also considered in determining
the presence and location of a high-reflectance object. The selected pre-flash
readings are added and averaged and the output of the main flash is calculated. Even
if the subject changes position, reflectance or size, the flash metering remains highly
accurate and stable.
The XTi's flash system features:
The eyelevel viewfinder shows approx 95% of the captured image with 0.8x magnification via a pentamirror with a fixed focusing screen. There is a builtin -3.0 - +1.0 diopter adjustment. Around the viewfinder is a soft rubber Ef frame that fits comfortably against your face or eyeglasses, it provides a 20mm eye point.
Canon offers E-series Dioptric Adjustment Lenses (from -4 to +2 values), the
Angle Finder C for 90° viewfinder applications, the EP-EX15 Eyepiece Extender
and replacement Ef rubber frames.
Inside the viewfinder are seven focusing points, the active focus point(s) are
illuminated to indicate which AF zone(s) are selected. Viewfinder information
includes - AF information (AF points, focus confirmation light), exposure information
(shutter speed, aperture value, AE lock, exposure level, AEB in progress, exposure
warning), flash information (flash ready, red-eye reduction enabled, red-eye reduction
lamp on, high-speed sync, FE lock, flash exposure compensation), maximum burst, CF card
information, White Balance Correction
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