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400D Settings
| Setting | Name | ISO | Shutter Speed | Aperture | Notes |
| A-DEP | Automatic Depth of Field |  | | Automatic | Aperture set based on focal points. |
| M | Full Manual | Manual | Manual | Manual | |
| Av | Aperture Priority | Manual | Automatic | Manual | Use for time-lapse and HDR. |
| Tv | Shutter Priority | Manual | Manual | Automatic | Rarely used. |
| P | Program AE | Manual | Automatic | Automatic | |
ISO
General rule of thumb = lower is better.
| 100 or 200 | 400 to 800 | 1600 |
| Sunny conditions | Overcast / evening | Night / lowlight |
| Sensor is least sensitive | | Sensor is most sensitive |
| No 'grainy' distortion | Maybe some 'grainy' distortion | Lots of 'grainy' distortion |
Shutter Speed
| 1/4k | 1/3.2k | 1/2.5k | 1/2.0k | 1/1.6k | 1/1.25k | 1/1k | 1/800 | 1/640 |
| 1/400 | 1/320 | 1/250 | 1/200 | 1/160 | 1/125 | 1/100 | 1/80 | 1/60 |
| 1/40 | 1/30 | 1/25 | 1/20 | 1/15 | 1/13 | 1/10 | 1/8 | 1/6 |
| 1/4 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1 | 1.3 | 1.6 |
| 2.5 | 3.2 | 4 | 5 | 6 | 8 | 10 | 13 | 15 |
| 25 | 30 | Bulb | | | | | | |
AEB Long Exposure
| Under | Normal | Over | Total |
| 0.25 | 1 | 4 | 5.25 |
| 0.3 | 1.3 | 5 | 6.6 |
| 0.4 | 1.6 | 6 | 8 |
| 0.5 | 2 | 8 | 10.5 |
| 0.6 | 2.5 | 10 | 13.1 |
| 0.8 | 3.2 | 13 | 17 |
| 1 | 4 | 15 | 20 |
| 1.3 | 5 | 20 | 26.3 |
| 1.6 | 6 | 25 | 32.6 |
| 2 | 8 | 30 | 40 |
Aperture
| F5.6 | F6.3 | F7.1 | F8.0 | F9.0 | F10 | F11 | F13 | F14 |
| F16 | F18 | F20 | F22 | F25 | F29 | F32 | F36 | |
| Small f-stop | Large f-stop |
| larger opening | smaller opening |
| Small DOF / shallow focus | Large DOF / deep focus |
| More light into camera | Less light entering camera |
| Isolates subject from background | Blends subject into background |
| Good for portrait | Good for landscape |
