Skip to content

Lenses, Corrections & Calibration

FocuZ keeps correction and focus settings per lens (L1–L8), so swapping lenses doesn't mean re-tuning. This section covers selecting a lens, distortion correction, the work-coordinate offset, focal height, and aligning the mark to the part.

Lens management

  • Pick the active lens (L1–L8) from the lens selector. Each lens carries its own field size, correction, work offset, and focal Z.
  • Selecting a lens shows a short summary of its settings.
  • When the lens needs a known Z reference, FocuZ may prompt to home / jog before marking (see the homing gate).

Distortion correction (the Corrections dialog)

Open Corrections (from the setup wizard or the lens controls). It has two modes for correcting galvo/lens distortion, and remembers settings per lens:

Load the .cor correction file your lens uses — the same file format EZCad2 and LightBurn use. The file supplies the distortion map and field size. You can optionally fine-tune Scale and Angle on top of it. (Manual-only fields are greyed out while a .cor is loaded.)

With no .cor, enter correction values directly:

  • Scale X/Y and Angle
  • per-lens Field size X/Y (mm)
  • Bulge, Parallel, and Trapezoidal correction (X/Y)

Round at center, distorted at the edges?

That's a distortion-correction issue — load the correct .cor for the lens, or tune the manual values. See Troubleshooting.

WCS (work coordinate) offset

The WCS offset shifts the work origin so the mark lands where the part actually is. It's stored per lens. Set it from the lens's WCS control (it opens the Corrections dialog for the active lens).

Focal height (Z) per lens

Each lens has a focal working distance. Set it on Jog ▸ Lens Offset:

  1. Jog Z to the optimum focal distance.
  2. Enter an Offset (the distance between the baseboard and the top of your test material).
  3. Click Save Z to commit the focal distance + offset to the active lens.

The Offset can be updated later without re-finding the focal distance.

Then Home & Jog to Lens 0 (on the Jog card) gets you straight back to focus for that lens.

Aligning the mark to the part

  • Calibration ▸ Offset (a Sequencer action) lets you mark or trace a target, drag it on the canvas to where it actually landed, and Apply the difference as the work offset.
  • Red Light Trace (Device menu) helps align the red pointer to where the IR beam fires (they have a small fixed parallax) and set the red-light offset and trace speed.

Per-lens actions confirm the target lens

Actions that change per-lens calibration apply to the currently selected lens and confirm which lens before applying — double-check it's the right one to avoid mis-calibrating another lens.

See also