1. What is the Shutter Speed Rule?

The shutter speed rule helps photographers determine the minimum shutter speed needed to avoid camera shake when shooting handheld. It states that your shutter speed should be at least the reciprocal of your focal length.

2. How Does the Calculator Work?

The calculator uses the basic shutter speed rule:

Where:

• Shutter Speed — In seconds (e.g., 1/60 means one sixtieth of a second)
• Focal Length — In millimeters (35mm equivalent)

Explanation: Longer focal lengths magnify both the subject and any camera movement, requiring faster shutter speeds to maintain sharpness.

3. Importance of Shutter Speed Calculation

Details: Using the correct shutter speed prevents motion blur from camera shake, especially important when shooting without a tripod or image stabilization.

4. Using the Calculator

Tips: Enter your lens focal length in millimeters (35mm equivalent). For crop sensor cameras, use the effective focal length (actual focal length × crop factor).

5. Frequently Asked Questions (FAQ)

Q1: Does this rule apply to all situations?
A: This is a general guideline. You may need faster speeds for moving subjects or slower speeds with stabilization.

Q2: How does sensor size affect this?
A: Use the 35mm equivalent focal length (multiply by crop factor for APS-C or other sensors).

Q3: What about image stabilization?
A: Modern IS systems may allow 2-4 stops slower shutter speeds than this rule suggests.

Q4: Does this apply to video?
A: The rule is primarily for still photography. Video typically uses fixed frame rates.

Q5: What if my calculated speed is too dark?
A: Increase ISO or open aperture to compensate while maintaining the minimum speed.