For iPad and macOS 11 Big Sur M1

Available on the AppStore

LightFinger – Moving Light to Followspot

Use the moving lights in your lighting rig as temporary followspots.. 

Accurately track the beam onstage using your iPad screen.
Or use a Mac with Apple Silicon.

Requires an ETC lighting console running Eos Version 3.0 or greater and an active network connection between the IOS device and the console.

Sometimes it’s just not possible to have a dedicated followspot for your show, but you might well have moving lights in your rig which can be temporarily re-purposed. It’s possible to follow a performer onstage using multiple cues and timings, but that doesn’t allow for any flexibility in performance, or for the rare occasions an actor makes a mistake! 😉

 It’s often not feasible for the lighting operator to manually track performers with moving lights using the console, either as they are too busy running the show, or their line of sight to the stage is not great. The Eos software, superb as it is, might not be ideally suited to the live operation of moving lights as manual followspots.

 Enter LightFinger… select the channel you want to control and your screen accurately maps the moving light on screen to the stage. You can control intensity and beam position with the app or simultaneously through the console.

Use LightFinger anywhere you have a network connection with the lighting console.

Eos can remotely enable and disable LightFinger moving light control to prevent accidents! Eos can also remotely select the moving lights to be used as followspots within the cue stack.

LightFinger, so easy anyone on the team can use it. So cost effective, your producer will thank you!

For more information contact:

Operation notes:

LightFinger requires an Eos console running 3.00 and Augment3D or greater, and an active network connection with the lighting desk. You should not run Eos and LightFinger on a public network. Coming soon is the ability to run LightFinger over a wired ethernet connection using an adaptor.

LightFinger connects over TCP using SLIP 1.1 – you can change this in the EOS shell.
Make sure OSC is enabled on the console: Setup -> System Settings -> Show Control ->
OSC. Make sure OSC RX & OSC TX are enabled. LightFinger uses OSC TCP Server port 3032. You do not need to provide the IP address of your IOS Device.

Select the IP of your Console via the settings screen of LightFinger, press the Connect button. If successful, the indicator next to the selected IP will change from red to green.
If connection is lost at any time the indicator will revert to red!

LightFinger updates the position and intensity of the selected channel only when Take Control is not selected. This is to avoid conflicting information being sent to the moving light, and to maintain a single ‘source of truth’ for the data.
Whilst running cues in the Cue Stack, intensity and and position are updated once per second only. So movement and intensity updates will not look smooth! This is a current limitation of the Eos software.

If you want to temporarily disable LightFinger send the exact OSC Command: /lightfinger/revokecontrol
from the console. This can also be done within the cue stack to enable/ disable control during performance to avoid unwanted input!

To enable LightFinger, from the console send the exact OSC Command:

To change the selected channel that LightFinger controls, from the console send the OSC Command:
(where xxx is the new channel).

To work correctly, moving lights must be setup correctly in Patch on the Console:
Establish where onstage your datum point (home position) will be. For many theatres it would be sensible to have this as the centre of your theatre’s Setting Line ( or Plaster Line).

This datum point should also correspond to the origin point on a CAD drawing if you are importing lights directly into the console.

ETC have a handy YouTube video about using Fixture Position Estimation (FPE) here: It’s really important that the console accurately knows where your moving lights are in the rig!

This datum point corresponds to the bottom centre of the control area on your iPad.

Select the unit in patch and click on the Augment3d tab. The lighting device you wish to control should have data for the X Y Z positions relative to your datum point .

Credits & Demo Mode

LightFinger has a fully unlocked demo mode for 10 minutes (in one continuous block of time) to allow you to trial the app and check that it is suitable for your requirements. When the demo mode expires you will no longer be able to control fixtures, but you will still get updated channel and position data, and the current cue from the EOS console in Observer mode. The observer mode resets back to demo mode after an interval, and the cycle repeats. To fully unlock the app for use during show conditions or rehearsals, please purchase and activate credits.

The credits based usage model, requires 1 credit to unlock the app for a continuous 24 hour period. Credits can be purchased in Settings of LightFinger. You can activate more than one credit at a time to enable usage for continuous periods of longer than 24 hrs.

Once activated a credit cannot be deactivated, re-used, or refunded.

NB: To purchase credits you will need an active internet connection to access the AppStore. After purchase don’t forget to change your network settings back to communicate with the console! You can activate as many credits as you like whilst offline.
Credits are treated as consumable items.. they do not expire, but cannot be restored if you delete the app or change accounts on the device.

Privacy Policy

LightFinger does not collect user data other than to manage AppStore purchases. This is the data collected by Apple.


LightFinger is a new app under active development. I would really welcome feedback, comments and suggestions. If you’ve got a feature request please get in touch! I have lots of exciting updates to the app planned. You can contact me at:


LightFinger © 2021 Colin Grenfell – All Rights Reserved

Eos® and Augment3D® are registered trademarks of Electronic Theatre Controls International.

LightFinger utilises the excellent open source software OSCKIT by Sammy Smallman.
(also many thanks to Sammy for help during development!)