1. What is the Shutter Speed Rule?

The reciprocal 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 1 divided by twice your focal length.

2. How Does the Calculator Work?

The calculator uses the reciprocal rule formula:

Where:

• \( \text{focal\_length} \) — Lens focal length in millimeters

Explanation: The rule accounts for camera shake being more noticeable with longer focal lengths, requiring faster shutter speeds to compensate.

3. Importance of Shutter Speed Calculation

Details: Using the correct shutter speed helps ensure sharp images when shooting handheld, especially important in low-light conditions or with telephoto lenses.

4. Using the Calculator

Tips: Enter your lens focal length in millimeters. The calculator will show the minimum recommended shutter speed to avoid camera shake.

5. Frequently Asked Questions (FAQ)

Q1: Is this rule absolute?
A: No, it's a guideline. Some photographers can handhold at slower speeds with good technique, while others may need faster speeds.

Q2: Does this apply to crop sensor cameras?
A: Yes, but remember to use the effective focal length (actual focal length × crop factor).

Q3: What about image stabilization?
A: With stabilization, you can often use slower shutter speeds than this rule suggests.

Q4: Why twice the focal length instead of just the focal length?
A: The more conservative 2× factor provides extra safety margin for sharper results.

Q5: Does this rule apply to moving subjects?
A: No, this only addresses camera shake. Moving subjects may require even faster shutter speeds.