1. What is a Working Distance Calculator?

Definition: This calculator estimates the working distance based on the focal length of a lens and the magnification factor.

Purpose: It helps photographers, microscopists, and optical engineers determine the optimal distance between the lens and the subject.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( WD \) — Working distance (meters)
• \( f \) — Focal length of the lens (meters)
• \( M \) — Magnification factor (dimensionless)

Explanation: The working distance increases with focal length and decreases with higher magnification.

3. Importance of Working Distance Calculation

Details: Proper working distance estimation ensures optimal focus, proper lighting, and sufficient space for equipment operation.

4. Using the Calculator

Tips: Enter the focal length in meters and the magnification factor. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is working distance in optics?
A: It's the distance between the front of the lens and the subject when the subject is in focus.

Q2: How does magnification affect working distance?
A: Higher magnification typically results in shorter working distances, while lower magnification allows for longer working distances.

Q3: What units should I use for focal length?
A: The calculator uses meters, but you can convert from millimeters by dividing by 1000 (e.g., 50mm = 0.05m).

Q4: Can I use this for microscope calculations?
A: Yes, this formula applies to microscope optics as well as photographic lenses.

Q5: What if my magnification is less than 1?
A: The formula works for any positive magnification value, including reduction (M < 1).