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View Full Version : Can someone please explain "GOBO Indexing" ?



Cinepost
01-23-2014, 09:03 AM
We are about ready to add a few moving LED lights with GOBO and need to know the advantages and extra cost for units with "Gobo Indexing".

When is it necessary? What units have it? How can I check?

Synaxis
01-23-2014, 09:32 AM
Gobo indexing allows you to rotate the gobo through DMX, and retain its position at a specific angel. Say, you mount your fixture upside down, and you put in your Gobo, but it is not projecting straight. Instead of having to remove it back and forth a couple times to get it right, you can just rotate it using DMX control.

The product specifications and manual should say if the fixture in question has this feature. It is pretty standard on higher priced fixtures though.

Cinepost
01-23-2014, 02:43 PM
If there was a channel of control for indexing, would it say "Index" or what?

light-o-matic
01-23-2014, 02:53 PM
Yea gobo/pattern position/index etc.. generally, any fixture that has this will have a gobo rotation speed channel as well, so you'll see it. But some cheaper fixtures have both on one channel.. like 0-127 index, 192 rotate CW speed, 193-255 rotate CCW speed. So, you have to check the manuals.

But gobo index is fun.. besides being crucial for gobos with text on them that you might want to project... if you have a lighting console or software with sufficient programmability you can do cool effects by running sequences on the index.

BillESC
01-24-2014, 04:48 PM
Under features, the fixture will specifically state "Indexing" if it does not, it doesn't.

Indexing allows you to store to a scene a specific orientation of the gobo.