From Amazon.com:

Manufacturer Description
Canon’s new EOS 50D bridges the gap between the novice and the seasoned pro with a perfect combination of high-speed and quality. It features an APS-C sized 15.1-megapixel CMOS sensor for tremendous images, new DIGIC 4 Image Processor for fine detail and superior color reproduction, and improved ISO capabilities up to 12800 for uncompromised shooting even in the dimmest situations. It features a refined 3.0-inch Clear View LCD (920,000 dots) monitor, supercharged Live View Function with Face Detection Live mode, plus a number of new automatic Image Correction settings and HDMI output for viewing images on an HDTV. Pick up the EOS 50D and you’ll experience true digital inspiration!

Canon EOS 50D Digital SLR Highlights

New 15.1-megapixel CMOS sensor with improved noise reduction

The EOS 50D features a newly-designed 15.1-megapixel APS-C sized CMOS sensor which is capable of recording up to 4752 x 3168 pixels with full 14-bit A/D conversion for extremely fine tonal gradation. Ready to capture images in an instant, the sensor is designed to work with Canon’s EF and EF-S lenses with a conversion factor of 1.6x. It’s capable of recording at sensitivities previously too noisy for shooting in low light or subjects in motion. With a maximum ISO rating of 12800 combined with a 4-level High ISO speed noise reduction function, images that would have been impossible without the use of a strobe or flash become simple to record.

Next generation DIGIC 4 Image Processor for faster processing
The EOS 50D operates with such effortless speed that operation is nothing short of intuitive. With instant startup times, speedy autofocus and minimal shutter lag, the EOS 50D is one of the fastest cameras available today. It can shoot up to 6.3 fps, in bursts of up to 90 JPEGs (using an UDMA CF card), 60 JPEGs (using a CF card) consecutively or 16 RAW files, so you’ll never, ever miss a shot.

DIGIC 4 Image Processor
This next generation DIGIC 4 Image Processor offers finer details and even more natural color reproduction, compared with the previous DIGIC III Image Processor. Since Canon’s DIGIC 4 chips use advanced signal processing technologies, they provide even faster operations, including write times to UDMA cards. It also enables Face Detection Live mode to detect and focus up to 35 face(s) to capture the best possible shot. Further, DIGIC 4 offers the improved Auto Lighting Optimizer that corrects brightness and contrast automatically, and Peripheral Illumination Correction for up to 40 EF lenses. DIGIC always maximizes performance between the capturing and recording stages of digital photography.

3.0-inch Clear View LCD The EOS 50D features a bright, high resolution, 3.0-inch Clear View LCD monitor with 920,000 (dots/VGA) pixels and a broad viewing angle of 160 degrees horizontally and vertically. It offers a brighter and more detailed display than the EOS 40D, includes a new smudge-resistant coating, and is perfect for accessing camera settings like ISO, Metering modes AF Point selection and flash options. Plus, it’s superb for reviewing, editing and deleting photos or composing new images in Live View Function.

Enhanced Live View shooting includes Face Detection Live mode
The EOS 50D features Canon’s most advanced Live View shooting thanks to the number of focusing modes available including Quick mode, Live mode and Face Detection Live mode. You can zoom in and navigate the composition 5x or 10x normal size, enabling critical focus. There’s even 2 overlay grid options, perfect for lining up vertical and horizontal lines. In the studio, the camera can be controlled remotely with Live View Function when the camera is connected to a computer through a USB cable, or wirelessly if the optional Wireless File Transmitter WFT-E3A is used.

9 cross-type high-precision sensors for accurate target subject acquisition
The EOS 50D has a high-precision 9-point wide area AF that uses cross-type points at f-stops of f/5.6 or faster, enabling the camera to focus faster, more accurately, and in difficult lighting situations. AF sensitivity is a stunning EV-0.5 to EV18. Adding to this AF performance, the EOS 50D incorporates a diagonally mounted cross-type sensor that is sensitive to both vertical and horizontal lines at f/2.8, perfect for enhanced operation in dim light. The EOS 50D has a number of focus modes, including One-Shot AF, AI Focus AF and AI Servo AF.

New Lens Peripheral Illumination Correction setting
Canon’s exclusive Lens Peripheral Illumination setting takes into account any light falloff in the corners of the frame and corrects it, making for a perfectly exposed image. Correction data are detected automatically on a number of Canon EF lenses and can be entered manually through included the Canon EOS Utility software.

Updated EOS Integrated Cleaning System
The EOS 50D’s Self Cleaning Sensor Unit eliminates stray dust that enters the camera when changing a lens or when out in the field. The sensor’s IR-cut/Low-pass filter cleans itself automatically with ultrasonic vibrations every time the camera is turned on or off and features a new flourine coating to minimize dust adhesion. Dust missed by the cleaning unit is captured by Canon’s Dust Delete Data Detection software and can be erased from the image file.

Self Cleaning Sensor Unit
A key element of minimizing dust is preventing it from clinging to the front surface of the imaging sensor. To combat this, the EOS 50D features a Canon-designed Self Cleaning Sensor Unit. The low-pass filter at the front of the sensor shakes off dust automatically with ultrasonic vibrations, removing dust from the sensor assembly. The EOS 50D also has a coating on the front surface of the low-pass filter, to increase its resistance to dust sticking to the sensor.

Dust Delete Data Detection

Dust Delete Data Detection
Dust that may still remain on the front of the sensor can also be erased with software included in Digital Photo Professional (DPP) Version 3.3 or later software. A simple test shot of a plain, white object can be taken, using a menu setting. This Dust Delete Data image is analyzed in-camera, and the location and size of any remaining dust is added to any subsequent pictures taken. This data is transmitted along with the image, whether JPEG or RAW, and can be either manually or automatically erased in Canon’s DPP software. This added software option ensures the cleanest possible image, perfect for printing or archiving.

Creative Auto goes a step beyond full auto with on screen setting display The EOS 50D has a new Creative Auto mode and a quick control screen that helps novice users narrow the gap between fully automatic and manual control. While the camera will remain by default in fully automatic mode, frequently changed settings like flash, exposure compensation, image quality and more are all accessible through one easy screen interface designed for intuitive, quick action. A provided shooting guide serves as a quick-reference for on-the-fly operation.

HDMI output for displaying full high-resolution images on a HDTV The EOS 50D includes a new HDMI (High Definition Multimedia Interface) output device that enables High Definition display of your photographs on any HDTV with HDMI ports. It’s remarkable to behold the details of your photographs in Full HD, and it’s easy with the EOS 50D. Resolution is set automatically to match the TV to which you’ve connected, and images are displayed in a full-frame 3:2 ratio with blacked out bars to the left and right of the image.

Compatible with over 60 Canon EF/EF-S lenses and most EOS System accessories

EF & EF-S Lenses
The EOS 50D is compatible with all Canon lenses in the EF and EF-S lineup, ranging from ultra-wide angle to super telephoto lenses. Canon lenses employ advanced optical expertise and micron-precision engineering to deliver unprecedented performance in all facets of the photographic process. Special optical technologies, such as Aspherical, ultra-low dispersion, or fluorite elements are featured in the universally acclaimed L-series lenses. And Canon’s Optical Image Stabilizer technology is featured in select lenses to minimize the effect of camera shake. Through Canon lenses, photographers can truly maximize the quality and liberating performance of the EOS 50D.

Flash Photography
The EOS 50D features the acclaimed E-TTL II flash metering system. With any of the flashes in the EX Speedlite line, E-TTL II provides reliable flash output whether shooting fill-in flash pictures in sunlight, or using flash in total darkness. With E-TTL II, the exact same 35-zone metering sensor used for measuring ambient light is also used for flash metering–giving even finer metering command of the image area. If you prefer a broader area for flash metering, there’s a menu setting to change to “Average” flash metering–where the entire 35-zone area is measured evenly for flash exposure.

Software

Canon EOS Digital Solution Disk (Version 17.0)
The EOS 50D comes bundled with an updated Canon EOS Digital Solution Disk, which features powerful software programs designed to extend the EOS experience to the computer. These include Canon’s EOS Utility (Version 2.5), Digital Photo Professional (Version 3.5), ZoomBrowser EX for Windows (Version 6.2), ImageBrowser for Macintosh OS X (Version 6.2), the Picture Style Editor (Version 1.4), PhotoStitch (version 3.2), WFT Utility (version 3.2). Each application is designed to perfect the captured images and streamline the digital workflow.

EOS Utility (Version 2.5) for Macintosh or Windows handles the connection between the camera and computer, whenever they’re connected via USB. It allows remote controlled shooting from the computer, handles downloading of images from the camera to the computer, and allows seamless linking to either Canon’s ZoomBrowser/ImageBrowser or Digital Photo Professional software once images have been copied to the hard drive. Furthermore, it’s used to upload settings back into a USB-connected camera.

Digital Photo Professional (Version 3.5) is an image processing program that enables high-speed RAW image processing, high-speed previewing for real-time image adjustment and support for sRGB, Adobe RGB and Wide Gamut RGB color spaces. Because it’s CMS (Color Management System) compatible, Digital Photo Professional allows for easy image layout and printing in Adobe RGB in conjunction with Easy-PhotoPrint and PictBridge printers. It also features the Dust Delete Data Detection tool for cleaner images.

ZoomBrowser EX (Version 6.2) for Windows and ImageBrowser (Version 6.2) for Mac OS X are the easy, user-friendly options for viewing and editing of JPEG and even RAW image files. Both allow viewing of numerous types of images including finished TIFF and BMP files. Both also have a variety of search options for finding images, allow re-naming of single images or batches of files, and offer a variety of options for printing without using a separate image-editing program.

Picture Style Editor (Version 1.4)
Canon’s Picture Style Editor enables photographers to create custom Picture Style profiles that can be used to customize the appearance of JPEG and RAW images captured with EOS Digital SLR cameras. Picture Style files created with Picture Style Editor can be loaded into the EOS cameras that support Picture Style and may also be used when processing RAW images in Canon software applications Digital Photo Professional, ZoomBrowser EX (for Windows) and ImageBrowser (for Mac).

Product Description
Canons new EOS 50D bridges the gap between the novice and the seasoned pro with a perfect combination of high-speed and quality. It features an APS-C sized 15.1-megapixel CMOS sensor for tremendous images, new DIGIC 4 Image Processor for fine detail and superior color reproduction, and improved ISO capabilities up to 12800 for uncompromised shooting even in the dimmest situations. It features a refined 3.0-inch Clear View LCD (920,000 dots) monitor, supercharged Live View Function with Face Detection Live mode, plus a number of new automatic Image Correction settings and HDMI output for viewing images on an HDTV. Pick up the EOS 50D and youll experience true digital inspiration!

• Alien Bees have a plastic case, and the White Lightning’s have a more durable aluminum case.
• The White Lightning units weigh more (4.1 lbs vs 2.1 lbs for 800 W units), and thus aren’t quite as easy to transport as the Alien Bees
• The Alien Bees flash units have a 150W modeling bulb, and the White Lightning uses a 250W modeling bulb.
• The White Lightning has separate manual controls for the flash and modeling power while the Alien Bees has a single control for them both.
• The Aliens Bees circuitry is more compact, and thereby runs hotter
• White Lightning has a 5 year warranty, Alien Bees warranty is 2 years
• White Lightning use multiple smaller capacitors for faster recycling
• Alien Bee units use a new and unique design on the power supply where the very heavy power transformer has been eliminated. The White Lightning units use a more traditional design with the transformer in the power supply.
• The White Lightning lights can be adjusted over a 7 stop range, whereas the Alien Bees can be adjusted over 5 stops
• The White Lightning units use multiple circuit cards, instead of a single one like the Alien Bees which makes repair easier

These are the main functional differences between the two, do you know of any others?

Digital SLR Camera Reviews Summary:

Who this camera is for:

• Point and Shoot power users looking to learn more about photography and learning how to use SLR cameras
• Existing Canon SLR photographers who would like something lighter for traveling but still an SLR format
• Point and shoot users looking to make better quality prints
• An extra SLR camera for wedding photographers, etc

Who this camera isn’t for:

• Photographers looking to take photos in tricky or low-light photography conditions
• Existing photographers looking to switch from a film SLR to a digital SLR
• Anyone looking for a very durable, long lasting SLR
• Someone who needs video capability

From the manufacturer:
The Canon EOS Digital Rebel XTi offers an unbeatable combination of performance, ease-of-use and value. It has a newly designed 10.1 MP Canon CMOS sensor plus a host of new features including a 2.5-inch LCD monitor, the exclusive EOS Integrated Cleaning System featuring a Self Cleaning Sensor and Canon’s Picture Style technology, all in a lightweight, ergonomic body. The Digital Rebel XTi is proof positive that Canon continues to lead the way with their phenomenal digital SLRs.

Product Description
The Canon EOS Digital Rebel XTi has a newly designed 10.1 MP Canon CMOS sensor plus a host of new features including a 2.5-inch LCD monitor, the exclusive EOS Integrated Cleaning System featuring a Self Cleaning Sensor and Canon’s Picture Style technology, all in a lightweight, ergonomic body. The EOS Digital Rebel XTi is compatible with all Canon lenses in the EF lineup, ranging from ultra-wide angle to super telephoto lenses, and including Canon’s EF-S series lenses, manufactured specifically for Canon’s APS-C sized digital sensor. Canon’s Speedlite 430EX is perfectly suited to the EOS Digital Rebel XTi. In addition to Canon’s EF lenses and Speedlite flashes, many other accessories are designed by Canon to work perfectly with the EOS Digital Rebel XTi. The Battery Grip BG-E3 adds a vertical shutter release, and can hold two NB-2LH Battery Packs for increased shooting capacity. Canon’s Semi Hard Case EH18-L can accommodate the EOS Digital Rebel XTi with a small zoom lens. An EF 18-55mm is included in the EOS Digital Rebel XTi Lens Kit. Image Sensor Type – High-Sensitivity, high-resolution, single-plate, CMOS sensor 3 – 2 Aspect Ratio Recording Format – JPEG, RAW, and RAW+JPEG simultaneous recording provided USB 2.0 Hi-Speed Interface, mini-B port, NTSC/PAL for video output Viewfinder Type – Eye-level SLR with pentamirror Shutter Speeds – 1/4000 to 30 seconds Self-timer – 10 seconds delay, 2 seconds delay with C.Fn-7-1 (mirror lockup) Continuous Shooting Speed – Approx. 3 fps (at shutter speed of 1/250 sec. or faster) Compatible Printers – CP and SELPHY Compact Photo Printers, PIXMA Photo Printers and PictBridge compatible printers (via USB Interface Cable IFC-400PCU) Power Source – One Battery Pack NB-2LH Image storage on CompactFlash Type I or II type memory cards (Not included) Dimensions – Width 4.98 x Height 3.71 x Depth 2.56 inch, 126.5 x 94.2 x 65mm / Weight – 18 ounces

Overall details from Amazon.com:

10.1-Megapixel APS-C Size CMOS Sensor
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 pixel resolution of 3,904 x 2,598, the Digital Rebel XTi not only offers the most pixels in its class, but bests many professional-level cameras. Recorded on Canon’s CMOS sensor, each pixel is captured with fine detail to create images of tremendous depth, nuance, and resolution, ensuring enough information for even poster-sized prints.

DIGIC II Image Processor
The EOS Digital Rebel XTi is the product of Canon’s extensive in-house development: The DIGIC II Image Processor was designed specifically for Canon digital SLR cameras and enhances every aspect of image capture. Information captured by the CMOS sensor is processed and assembled into images of exceptional quality. With the DIGIC II Image Processor on board, photographers can expect natural color reproduction, precise white balance in any number of lighting situations, and unparalleled clarity. The DIGIC II Image Processor employs sophisticated signal processing algorithms and works at greater speeds, all while consuming less energy. The entire processing chip–not just the software that drives it–is dedicated for use in a digital still camera.

Responsive and Reliable
The EOS Digital Rebel XTi has a brilliant 2.5-inch LCD monitor with approximately 230,000 pixels. Also used in Canon’s Professional EOS SLRs, this screen displays more than images. Shooting information and playback are both displayed on the LCD, so that the photographer can see all of the shooting information simultaneously on one screen. Not only can images be viewed larger than on the Digital Rebel XT, they can be viewed at a greater angle (160 degrees) than many other conventional LCD monitors.

Display Off Sensor
When composing images, the Digital Rebel XTi’s external display turns off automatically thanks to the newly developed Display Off Sensor. This new sensor detects the photographer’s face against the back panel of the camera, and turns the screen off to prevent the LCD monitor’s brightness from disturbing the photographer’s eye while looking through the viewfinder.

Speedy Operation
With a startup time of 0.2 seconds, the EOS Digital Rebel XTi is ready to go the instant it’s brought to the eye. And the Digital Rebel XTi’s shutter can record images as fast as 1/4000 seconds and as long as 30 seconds, plus bulb at up to 3 frames per second (fps) for 27 consecutive shots. It synchronizes with Canon Speedlites at 1/200 second.

EF-S 18-55mm f3.5-5.6 USM Standard Zoom Lens
This kit includes a standard zoom exclusively for the EOS Digital Rebel and EOS 20D SLR cameras, with APS-C size image circle equivalent to an approximately 28-90mm focal length. The lens is compact and ultra-lightweight with impressive close-focusing ability of 0.9 feet (0.28 meters). It features optimized coating for digital imaging sensor to minimize ghost images and flare.

9-Point AF
The EOS Digital Rebel XTi has a high-precision 9-point AF system for speedy and accurate focusing in any situation. Conveniently located on the back of the camera for thumb-controlled action, Canon’s cross key buttons enable instant choice of the 9 focus points or allow the camera to choose them automatically. One-Shot is perfect for still photography. AI Servo AF tracks moving subjects, ensuring accurate focus. AI Focus AF switches between One-Shot and AI Servo when subjects are moving and stopping. The Digital Rebel XTi’s focusing system functions in metering ranges of EV-0.5 to 18 and displays information on the Digital Rebel XTi’s big LCD display.