đˇ Camera Lens Helicoid Extension Calculator
Helicoid Extension = f² / (u - f)
where f = focal length (mm), u = object distance (mm)
đŻ Calibration Points for Your Camera
đĄ Understanding the Graph
- Horizontal axis: Distance to object you want to focus on (meters)
- Vertical axis: How far the helicoid needs to extend from infinity position (mm)
- The curve: Shows the non-linear relationship - closer objects need much more extension.
- Infinity (â): Zero extension - lens at its base position.
- Minimum focus distance: Equals the focal length (theoretical limit).