| Manufacturer | Canon | |
| Model | EOS 20D | |
| Image Sensor | 22.5 x 15.0mm CMOS | |
| Effective Pixels | Approx. 8.2M | |
| Total Pixels | Approx. 8.5M | |
| Aspect Ratio | 3:2 | |
| Lens Mount | EF/EF-S | |
| Field of View Crop (Multiplier) | 1.6x with EF lens fitted | |
| AF System / Points | 9-point AF | |
| AF Modes | AI Focus, One Shot, AI Servo | |
| AF Point Selection | Automatic selection, Manual selection | |
| Selected AF Point Display | Superimposed in viewfinder and indicated on top LCD panel | |
| Predictive AF | Yes | |
| AF Lock | Locked when shutter button is pressed half way in One Shot AF mode. | |
| AF Assist Beam | Yes | |
| Manual Focus | Selected on lens | |
| Metering Modes | TTL full aperture metering with 35-zone SPC, (1) 35 Point Evaluative (linked to all AF points), (2) Partial metering at centre (approx. 9% of viewfinder), (3) Centre weighted | |
| AE Lock | Auto: Operates in 1-shot AF mode with evaluative metering when focus is achieved. Manual: Works independently at all times, Works in creative zone modes. | |
| Exposure Compensation | +/- 2 EV, 1/2 or 1/3-stop increments | |
| AEB | +/- 2 EV, 1/2 or 1/3-stop increments | |
| ISO Speed Equivalent | AUTO(100,200,400), 100, 200, 400, 800, 1600, Expanded to 3200 | |
| Type | Electronically-controlled focal-plane shutter | |
| Shutter Speed | 30-1/8000 sec, Bulb. | |
| WB Settings | AWB, Daylight, Shade, Cloudy, Tungsten, Fluorescent, Flash, Custom, Colour Temperature Setting. | |
| WB Bracketing | +/-3 stops in full stop increments, 3 bracketed images per shutter release. Selectable Blue/Amber bias or Magenta/ Green bias. | |
| Colour Spaces | sRGB and Adobe RGB. | |
| Viewfinder Coverage | Approx. 95% | |
| Magnification | 0.9x | |
| Dioptre Correction | -3 to +1 dpt | |
| Depth of Field Preview | Yes | |
| LCD Monitor | 1.8in TFT, approx. 118,000 pixel | |
| LCD Brightness | Adjustable to one of five levels | |
| Flash Modes | Auto, Manual Flash On/Off, Red-Eye Reduction | |
| HotShoe / PC Terminal | Yes / Yes | |
| X-sync | 1/250sec | |
| Red-eye Reduction | Yes | |
| Flash Exposure Compensation | +/- 2EV in 1/2 or 1/3 increments | |
| Flash Exposure Bracketing | Yes | |
| Flash Exposure Lock | Yes | |
| Second Curtain Synchronisation | Yes | |
| Built-in Flash Range | Coverage upto 17mm focal length (27mm equivalent) | |
| Guide Number (ISO 100, metres) | 13 | |
| External Flash | E-TTL II with EX series Speedlites, wireless multi-flash support | |
| Shooting Modes | Full Auto, Portrait, Landscape, Close-up, Sports, Night Portrait, No Flash, Shutter priority AE, Aperture priority AE, Manual, A-DEP | |
| Photo Effects | Monochrome mode (selected from the Shooting menu) with options for Filters and Toning Effects. | |
| Drive Modes | Single/Continuous | |
| Continuous Shooting | 5fps (speed maintained for up to 23 JPEG images) | |
| Image Size | (LF) 3504x2336, (LN) 3504x2336, (MF) 2544x1696, (MN) 2544x1696, (SF) 1728x1152, (SN) 1728x1152, (RAW) 3504x2336 | |
| Compression | Fine, Normal, RAW | |
| Still Image Format | JPEG (Exif 2.21 [Exif Print] compliant)/Design rule for Camera File system, RAW & JPEG simultaneous recording, Digital Print Order Format [DPOF] Version 1.1 compliant | |
| RAW+JPEG Simultaneous Recording | Yes | |
| File Numbering | (1) Consecutive numbering, (2) Auto reset | |
| Custom Functions | 18 Custom Functions with 50 settings | |
| LCD Panel (EL) Illumination | Yes | |
| Orientation Sensor | Yes | |
| Histogram | Yes | |
| Playback Zoom | 2x - 10x | |
| Image Erase | Single image, All | |
| Self Timer | Approx. 10 sec. | |
| Menu Categories | (1) Shooting Menu, (2) Playback menu, (3) Setup menu | |
| Menu Languages | English, German, French, Dutch, Danish, Finnish, Italian, Norwegian, Swedish, Spanish, Simplified Chinese, Japanese | |
| Computer Interface | USB 2.0 Hi-Speed (Mini-B) | |
| Other Interface | Video output (PAL/ NTSC) | |
| Memory Card | CompactFlash Type I / II (Microdrive compatible) | |
| Software | EOS Viewer Utility, Canon DPP (v1.1), PhotoStitch, TWAIN (Windows 98 / 2000), WIA (Windows Me), Photoshop Elements v2 | |
| Battery Type | Rechargeable Li-ion Battery BP-511/BP-511A or BP-512/BP-514 (BP-511A battery supplied) | |
| Battery Life | Approx. 1000 (at 20°C), Approx. 750 (at 0°C) | |
| Power Saving | Power turns off after 1, 2, 4, 8, 15 or 30mins. | |
| Body Materials | Magnesium Alloy/Plastic | |
| Dimensions | 144 x 105.5 x 71.5mm | |
| Weight (body only) | Approx. 685g | |