Specifications EOS 40D

Body: Specified as "magnesium alloy exterior," implying the frame is something less exotic.

Finder: 95% linear coverage. 0.95x magnification (50mm lens). Eye relief (eyepoint) 22mm. -3 to +1 diopter. Glass pentaprism, no eyepiece shutter.

AF: 9 cross points, work up to f/5.6. (Same points as 20D and 30D, but otherwise completely new.) Auto and manual selection. The central point offers extra precision at f/2.8 in both cross directions, a first in any Canon. Canon claims the "AF calculation speed" is 30% faster than the 30D, but that's fluff, since the calculation speed is only one part of many processes involved in the AF system.

Flash Metering: E-TTL II, identical to the 20D and 30D. New wireless remote control of the settings of the 580EX II.

Built-in Flash: Yes, covers 17mm lens, GN 13m/43' at ISO 100.
Maximum Shutter Speed with Flash: 1/250, normal sync
Shutter: 30s - 1/8,000.

Shutter Death: Tested, but not guaranteed, to 100,000 cycles. I suspect if you can kill it under warranty, you're covered regardless of how many frames you get off.

Frame Rate: 6.5 FPS. The shutter and mirror have separate motors.

Buffer Depth: 75 JPG or 17 raw

Image Sensor: 10.1MP CMOS, 1.6x crop factor, made by Canon. 22.5 x 15.0mm. 14-bit A/D conversion, suggest better high ISOs and lower noise.
Ultrasonic Sensor Cleaner.

Image Sizes: 3,888 x 2,592 native, also 2,816 x 1,880 (M) and 1,936 x 1,288 (S). Raw comes in your choice of 3,888 x 2,592 (raw) and 1,936 x 1,288 (s-raw).
ISO: 100 - 1,600 (ISO 3,200 turned on in a custom function).

LCD: 3," 230,000 pixels. a 3" LCD has 20% less linear resolution. In simple English, this 3" LCD shows the same detail and information as today's 2.5" LCDs, just bigger.
Storage: Compact Flash types I and II. with optional WFT-E3A you can plug in a USB hard drive and record to it.

Power: BP-511A rechargeable lithium-ion and CG-580 charger, same as 30D, 20D
Size: 5.7 x 4.2 x 2.9" W x H x D, (145.5 x 107.8 x 73.5mm), rated.

Weight: 26.1 oz (740g), rated, usually stripped of battery, card, lens, etc.