Sensor & Lens Configuration
Enter your camera's sensor dimensions and the lens's marked focal length. These are used to compute the estimated real focal length in millimetres from the calibrated pixel focal lengths.
Full frame = 36 mm | S35 = 24.89 mm
The marked / stated focal length on the lens barrel
×
Auto-detected from uploaded images
Quick presets
Calibration Pattern
Configure the printed calibration target you will photograph. Checkerboard is the most reliable and widely supported option.
Number of internal corner intersections horizontally
Number of internal corner intersections vertically
Physical size of each square on the printed/displayed target
Capture guidelines for reliable calibration
- Use 15–30 images — more is better, diminishing returns above 40
- Cover all four corners and the centre of the frame across your set
- Tilt the board ±30° in X, Y, and Z axes between shots
- Keep the board flat — mount on rigid aluminium or foam board
- Avoid motion blur, focus the board sharply, use consistent exposure
- Shoot at your working aperture (not wide-open, not diffraction-limited)
Live Preview
10 × 7 squares — 9 × 6 inner cornersGreen dots mark the inner corner intersections OpenCV detects
Calibration Images
Upload your calibration image set. Images are sent securely to the LensForge compute server and deleted immediately after processing — nothing is stored.
Drop images here
or
JPG · PNG · TIFF · BMP · WEBP