Harman Martin Exterior Projection 1000, User Manual, Page: 28 / 60

28 Exterior Projection 1000 User Manual
Gobo rings can be ordered in a set of 10 as an accessory from your Martin supplier. Ask for
P/N MAR-91611851.
The ring must be glued to the gobo using a silicone adhesive sealant that bonds to glass and
metals and that is suitable for use in temperatures from -55° C to 200° C continuous operation.
See page 38 for instructions on replacing rotating gobos.
Gobo indexing angles and precise gobo indexing
Mechanical tolerances mean that there can be small changes in the indexing angles (i.e. rotational
angles) of gobos when you rotate them or change gobos and then return to the initial indexing
angle.
From firmware version 1.7.0 (available early 2020), a ‘Precise gobo indexing’ mode is available on
the fixture settings DMX channel 20. This mode returns gobos more accurately to their original
position after a move. If you require the tightest possible gobo indexing angle repeatability and the
fixture is running an earlier firmware version, we recommend that you update to firmware v. 1.7.0
or later and enable ‘Precise gobo indexing’.
In ‘Precise gobo indexing’ mode, the fixture always moves gobos to their programmed angles from
a counterclockwise direction (as seen when looking at the projection). If you enable ‘Precise gobo
indexing’, you should also always move gobos to indexing angles from a counterclockwise
direction while you are programming a show on a DMX controller or programming a stand-alone
show as described under ‘Programming a standalone show’ on page 21. If you overshoot the
desired angle, do not fix the problem by moving the gobo back to the desired angle in a clockwise
direction. Instead, move the gobo back
past the desired angle in a clockwise direction, then move
it to the desired angle from a counterclockwise direction again.
Note that you do not need to have ‘Precise gobo indexing’ mode selected during programming. In
fact, it might be easier to disable this mode during programming and then enable it in the final cue.
Note also that slow fading from one gobo indexing angle to another is slightly less smooth when
‘Precise gobo indexing’ mode is enabled. If you want to compensate for this, use short fades or
snap to indexed angles, or program a blackout cue prior to the indexed position.
Finally, remember that – no matter which fixtures you are using – you can avoid visible differences
in gobo indexing angles if you avoid programming very tight gobo mapping in multiple fixtures. For
example, avoid aligning a vertical or horizontal line in gobo projections from two or more fixtures.