1. What is APS-C Crop Factor?

The APS-C crop factor compares the imaging area of an APS-C sensor to a full-frame (35mm) sensor. It's used to calculate equivalent focal lengths and field of view when comparing different sensor sizes.

2. How Does the Calculator Work?

The calculator uses the APS-C crop factor formula:

Where:

• 43.27 — Diagonal of full-frame sensor (mm)
• Sensor Diagonal — Measured diagonal of APS-C sensor (mm)

Explanation: The crop factor shows how much smaller the APS-C sensor is compared to full-frame, affecting field of view and effective focal length.

3. Importance of Crop Factor

Details: Understanding crop factor is essential for photographers comparing lenses across different camera systems and calculating equivalent fields of view.

4. Using the Calculator

Tips: Enter the sensor diagonal measurement in millimeters. Common APS-C diagonals range from 26.7mm to 30.1mm depending on manufacturer.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical crop factor for APS-C cameras?
A: Most APS-C cameras have crop factors between 1.5x (Nikon, Sony) and 1.6x (Canon).

Q2: How does crop factor affect focal length?
A: Multiply the lens focal length by the crop factor to get the full-frame equivalent focal length.

Q3: Does crop factor affect aperture?
A: No, the aperture remains the same, but depth of field will appear deeper compared to full-frame at the same aperture.

Q4: Why 43.27mm for full-frame diagonal?
A: This is the diagonal measurement of a 36mm × 24mm sensor (standard 35mm full-frame dimensions).

Q5: Are all APS-C sensors the same size?
A: No, there are slight variations between manufacturers, which is why measuring your specific sensor diagonal is important.