Canon DSLR cameras are widely trusted for their durability and performance, but like any electronic device, they are not immune to errors. One of the more concerning messages photographers may encounter is Error 20. Seeing this warning appear on the LCD screen can be alarming, especially during an important shoot. Understanding what Canon DSLR Error 20 means, what causes it, and how to fix it can help photographers act quickly and prevent further damage to their equipment.
TLDR: Canon DSLR Error 20 usually indicates a mechanical malfunction, often related to the shutter or mirror assembly. It can be triggered by worn shutter components, mirror mechanism issues, or internal electrical faults. Basic troubleshooting steps like removing the battery, resetting the camera, or cleaning lens contacts may solve minor cases. Persistent issues typically require professional repair, especially if a shutter replacement is needed.
What Is Canon DSLR Error 20?
Canon DSLR Error 20 is a mechanical malfunction error. When this message appears, the camera is indicating that it has detected a problem with one of its internal mechanical components. In most cases, the issue involves the shutter assembly, but it can also relate to the mirror mechanism or other moving internal parts.
Unlike card errors or communication errors, Error 20 is more serious because it typically points to hardware failure rather than user misconfiguration. The camera may lock up, refuse to take photos, or produce black or partially exposed images.
Common Causes of Error 20
There are several potential reasons why a Canon DSLR may display Error 20. Identifying the underlying cause helps determine whether the issue can be fixed at home or requires professional service.
- Worn or Damaged Shutter: The shutter mechanism has a limited lifespan, measured in actuations. Once it reaches its limit, failure becomes more likely.
- Mirror Mechanism Problems: If the mirror fails to flip up or down correctly, the camera may trigger Error 20.
- Obstructions Inside the Camera: Debris or foreign particles inside the mirror box can interfere with moving parts.
- Electrical Contact Issues: Poor communication between lens and body may sometimes trigger mechanical-related errors.
- Battery Power Fluctuations: In rare cases, unstable power supply can interrupt mechanical operations.
Understanding these causes is essential before attempting any fix.
How the Shutter Mechanism Works
The shutter mechanism is one of the most critical components of a DSLR. When the photographer presses the shutter button, several actions occur almost simultaneously. The mirror flips up, the shutter curtains open and close to expose the sensor, and then the mirror returns to its original position.
If any part of this sequence fails, the camera detects incomplete movement and may display Error 20. Because these are precision components operating at high speed, even minor wear can eventually cause failure.
Initial Troubleshooting Steps
Before assuming the worst, photographers should attempt several simple troubleshooting steps. While these may not fix severe mechanical failures, they can resolve temporary glitches.
1. Power Cycle the Camera
- Turn the camera off.
- Remove the battery.
- Wait at least 5–10 minutes.
- Reinsert the battery and turn the camera back on.
This resets internal electronics and may clear minor faults.
2. Remove and Reattach the Lens
- Detach the lens carefully.
- Inspect the lens contacts for dirt or corrosion.
- Clean contacts gently with a microfiber cloth.
- Reattach the lens securely.
Improper communication between lens and body can sometimes contribute to error messages.
3. Try a Different Battery
If available, insert a fully charged and genuine Canon battery. Inconsistent power delivery can occasionally interrupt shutter operation.
4. Factory Reset
Using the camera menu, reset all settings to factory defaults. Though Error 20 is typically mechanical, restoring default settings ensures no custom configuration is contributing to the issue.
When the Shutter Has Failed
If Error 20 persists after basic troubleshooting, the most likely cause is shutter failure. DSLR shutters are rated for a specific number of actuations:
- Entry-level cameras: 50,000–100,000 actuations
- Mid-range cameras: 100,000–150,000 actuations
- Professional models: 200,000+ actuations
Once this count is exceeded, the risk of failure increases significantly. Symptoms of shutter failure include:
- Black images
- Partially exposed photos
- Unusual clicking sounds
- Mirror getting stuck
In these cases, a shutter replacement is often required.
Repair vs Replacement: What Are the Options?
When faced with persistent Error 20, photographers must choose between repairing the camera or replacing it. Several factors influence this decision.
| Option | Average Cost | Pros | Cons |
|---|---|---|---|
| Professional Shutter Replacement | $200–$400 | Extends camera life, retains familiar gear | May approach value of older cameras |
| Independent Repair Shop | $150–$350 | Often cheaper, quicker turnaround | Quality varies by technician |
| Buy Refurbished Body | $300–$800 | Warranty included, newer features | Higher upfront cost |
| Upgrade to Mirrorless | $700+ | No mirror mechanism, newer technology | Requires lens adapter or new lenses |
For entry-level DSLRs that are several years old, replacement may be more economical than repair.
Can Error 20 Be Prevented?
While mechanical failure cannot be entirely avoided, certain practices help reduce risk:
- Avoid excessive high-speed continuous shooting over long periods.
- Keep the camera clean to prevent debris entering the mirror box.
- Use genuine batteries to ensure stable power delivery.
- Monitor shutter count using software tools to estimate lifespan.
- Store gear properly in dry, dust-free environments.
Preventive maintenance can add years to a DSLR’s working life.
Is It Safe to Keep Using the Camera?
If Error 20 appears intermittently and then disappears, continued use may worsen the underlying mechanical problem. Forcing the camera to fire repeatedly can cause additional damage to internal components.
Professionals are advised to stop using the camera immediately once Error 20 appears consistently. Continuing to shoot important jobs with unreliable hardware carries significant risk.
Professional Repair Process
When sent to an authorized service center, technicians typically:
- Diagnose the error using internal diagnostic tools.
- Inspect shutter and mirror assemblies.
- Replace defective components.
- Calibrate shutter timing and exposure.
- Perform general cleaning and firmware updates.
After repair, the camera often receives a limited repair warranty, providing additional peace of mind.
Final Thoughts
Canon DSLR Error 20 is a serious but manageable issue. In most cases, it indicates a mechanical malfunction related to the shutter assembly. While basic troubleshooting steps may resolve minor glitches, persistent errors usually require professional intervention. Photographers should weigh repair costs against the value of their camera body before making a decision. With proper maintenance and timely servicing, DSLR cameras can continue delivering excellent performance for many years.
Frequently Asked Questions (FAQ)
1. What does Canon Error 20 specifically mean?
Error 20 indicates a mechanical malfunction inside the camera, most commonly related to the shutter or mirror mechanism.
2. Can I fix Error 20 myself?
Basic troubleshooting like removing the battery or cleaning lens contacts can be done at home. However, shutter replacement requires professional repair.
3. How much does it cost to fix Error 20?
Repair costs typically range from $150 to $400 depending on the camera model and repair provider.
4. Is Error 20 covered under warranty?
If the camera is still within its manufacturer warranty period, repair may be covered. Accidental damage is usually excluded.
5. Will updating firmware fix Error 20?
Firmware updates rarely fix Error 20 because it is generally caused by mechanical, not software, issues.
6. How do I know if my shutter is worn out?
High shutter count, black frames, partial exposures, and repeated Error 20 messages are common indicators of shutter failure.
7. Should I repair or upgrade?
If the repair cost approaches or exceeds half the value of the camera, upgrading to a newer model may be the better investment.