Laid up at home for a few days. Have my 30D and wife's XTi and manuals in hand. Let's see how they compare spec for spec. I am only listing specs that are different.
For complete specs you can go:
XTi = http://www.usa.canon.com …egoryid=215&modelid=14256![]()
30D = http://www.usa.canon.com …egoryid=215&modelid=12929![]()
Body Dimensions
XTi = 126.5 x 94.2 x 65 mm / 5.0 x 3.7 x 2.6 in Weight: 510 g 18.0 oz (High Impact Plastic)
30D = 144 x 105.5 x 73.5 mm / 5.7 x 4.2 2.9 in Weight: 700 g 24.7 oz (magnesium-clad body)
Pixels
XTi = Effective: 10.10 mpix Total: 10.50 mpix
30D = Effective: 8.20 mpix Total: 8.5 mpix
Dust Deletion Feature
XTi = Sensor Cleaning: Manual and Auto Dust Delete Data appended to image data
30D = Sensor Cleaning: Manual
File Size (partial Listing)
XTi = Large/Fine: ~3.8 MB (3888 x 2592) Med/Fine: ~2.3 MB (2816 x 1880) RAW: ~9.8 MB (3888 x 2592)
30D = Large/Fine ~3.6 MB (3504 x 2336) Med/Fine: ~2.2 MB (2544 x 1696) RAW: ~8.7 MB (3505 x 2336)
White Balance
XTi = Auto, daylight, shade, cloudy, tungsten, white florescent light, flash, custom
30D = As above plus color temperature setting and color transmission
Viewfinder Information
XTi = AF points, focus combination light, shutter speed, aperture, AE lock, exposure level, exposure warning, flash ready, high-speed synch, FE lock, flash exposure compensation, WB correction, maximum burst, CF card information
30D = As above plus ISO speed, spot metering circle, red-eye lamp indicator
ISO speed
XTi = 100 - 1600 in 1/3 stop increments
30D = same, but ISO speed can be expanded to 3200
Shutter Speed
XTi = 1/4000 to 30 sec. x-sync at 1/200 sec
30D = 1/8000 to 30 sec. x-sync at 1/250 sec
External Speedlite
XTi = E-TTL II auto flash with EX-series Speedlite and Zooming to match focal length
30D = As above plus PC Terminal provided
Drive
XTi = 3 shots per second maximum
30D = 5 shots per second maximum/low speed 3 shots per second
Maximum burst
XTi = JPG (Large/Fine) ~27, RAW ~10, RAW/JPG ~8
30D = JPG (Large/Fine) ~30, RAW ~11, RAW/JPG ~9
LCD Monitor
XTi = 7 levels available
30D = 5 levels available
AF Point Display in Image Playback
XTi = No
30D = Enabled
Battery Life
XTi = At 23° C / 68° F No Flash: 500 50% Flash: 360---at 0° C/ 32° F 370/280
30D = At 23° C / 68° F No Flash: 1100 50% Flash: 750---at 0° C/ 32° F 900/600
Power Saving
XTi = Power turns off after 30 sec, 1, 2, 4, 6, 15 min
30D = Power turns off after 1, 2, 4, 6, 15, 30 min
Customization
XTi = 11 Custom Functions with 29 settings
30D = 19 Custom Functions with 53 settings
Differences in 30D: Flash firing for PC Terminal, Turn off AF point flashing in viewfinder, AF Point Selection Method, Safety Shift in AV or TV, Lens AF Stop Button Function
There are six pages of specs listed in the manuals. I was surprised how many of the specs were the same. These are both very good cameras designed for different users.

