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Lens / Iris Axis Scale - Display Scale vs Internal Scale

Summary

An image-defined question asked how display scale and internal scale should match when setting up an iris axis. The community answer was that focus/zoom/iris axes should normally use Recalculating Scale; for arbitrary-unit axes such as iris/zoom, display and internal scale usually match unless there is a deliberate reason to remap units.

Symptoms

  • New iris, focus, or zoom axis shows confusing scale warning.
  • Displayed units do not match expected motor movement.
  • Operator is unsure whether to use 1:1 scale or recalculated scale.

Evidence

Timestamp User Media Evidence
2021-02-11 00:26 Niko Flair axis scale setup screenshot showing display scale, internal scale, and recalculating scale question for iris axis. Image description: Flair axis scale / iris setup screen asking how Display Scale, Internal Scale, and Recalculating Scale should match.
2021-02-11 00:26 - Niko: Image description: Flair axis scale / iris setup screen asking how Display Scale, Internal Scale, and Recalculating Scale should match.

Media Text / Description

  • Media 1: 2021-02-11 00:26 - Niko: Image description: Flair axis scale / iris setup screen asking how Display Scale, Internal Scale, and Recalculating Scale should match.

WhatsApp Excerpts

Media Text / Description

  • Display Scale
  • Internal Scale
  • Recalculating Scale
  • iris axis setup
  • Image description: Flair axis scale setup screen for iris, focus, or zoom showing display/internal scale mapping controls.

[11/2/2021, 12:26:51 am] ~ Niko: Some days ago, making some tests, I tried to setup an iris axis and flair showed this message. Finally I recycled another axis and worked fine. But... How is supposed to match display and internal scales? Using the "Recalculating scale" option?

[11/2/2021, 12:37:51 am] Timothy Heys Cerchio: Yes, that should do the trick! Usually an axis for Focus Zoom or Iris which hasn't been modified has a 1:1 scale 😉

[11/2/2021, 12:55:49 am] ~ Niko: My intention was to locate the iris axis next to the focus axis. that's why I tried to set it from scratch on the following axis position

[11/2/2021, 12:56:17 am] ~ Niko: By the way... Is there some way to hide an axis?

[11/2/2021, 1:33:20 am] Timothy Heys Cerchio: Not that I know of. Unless you put it off main screen beyond the *ShownAxes

[11/2/2021, 1:58:44 am] ~ Niko: That's the only way I found

[11/2/2021, 3:19:27 am] ~ Simon Wakley: Nope. You can’t hide an axis but you can copy to a later off screen location. The internal and display scale should be the same for iris and zoom axes as it does it really represent anything sensible

Community Solutions

[LIKELY] Use Recalculating Scale For Lens Axes

Open Setups -> Axis Setup, select the focus / zoom / iris axis, and use the axis scale controls to enable the Recalculating Scale workflow so Flair maps motor movement to the desired displayed lens values.

Confidence: 0.78

[LIKELY] Keep Internal And Display Scale Matching For Arbitrary Iris / Zoom Values

If the axis values are arbitrary or normalized rather than real-world units, keep Display Scale and Internal Scale matching in Setups -> Axis Setup unless there is a deliberate remap.

Confidence: 0.7

[UI_SPECIFIC] Standard Robot Axes Are Usually 1:1 Unless Deliberately Rescaled

Do not copy lens-axis scaling logic blindly to robot axes. Standard axes in Setups -> Axis Setup are normally 1:1 unless a specific kinematic scale is required.

Confidence: 0.74

Official Documentation

Flair Classic Manual — Ch.5 Setups: Lens Setup — p.54

Flair 7 Manual — Ch.5 Setups: Lens Setup — p.39