📷 Camera Lens Helicoid Extension Calculator

Helicoid Extension = f² / (u - f)
where f = focal length (mm), u = object distance (mm)

Focal Length:

50mm

Distance to the object:

m

🎯 Calibration Points for Your Camera

💡 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 (∞): Zero extension - lens at its base position.
Minimum focus distance: Equals the focal length (theoretical limit).