Optical Configuration; Gobos; Rotating Gobo Wheels - Martin MAC 2000 Profile User Manual

O
PTICAL CONFIGURATION

Gobos

Specifications
All gobo slots including the seven color/gobo wheel positions accept round theatrical size-E glass gobos. Aluminum
gobos are suitable for short-term use only. For best results, custom gobos should meet the following criteria.
Outside diameter: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37.5 +0/-0.3 mm (1 15/32 +0/-0.01 in.)
Maximum image diameter: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mm (1 3/16 in.)
Material: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High temperature Borofloat or better glass
Coating: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dichroic or enhanced aluminum
The color/gobo wheel accepts 1.1 mm thick gobos and color filters. Thinner gobos must be secured with a drop or two
of glue. Use a high-temperature silicone adhesive such as Dow Corning's 732 Multi-Purpose Sealant.
The rotating-gobo wheel positions hold gobos up to 3 mm thick with the gobo retention spring. Gobos thicker than 3
mm must be glued in the holder.
Orientation
Coated gobos are inserted with the coating against the rim of the holder (away from the spring). Textured gobos are
inserted with the smooth side against the spring. This provides the best results when combining rotating gobos.
When an object is held up to the coated side
there is no space between the object and its
reflection. The back edge of the gobo cannot
be seen when looking through the coated
side.

Rotating gobo wheels

Figure 16 shows the standard gobo configuration.
5
4
3
Gobo wheel 1
Coated side
Figure 15: Finding the coated side
1
1
2
2
Gobo wheel 2
Figure 16: Standard gobo configuration as seen from lamp

Optical configuration

Uncoated side
When an object is held up to the uncoated
side there is a space between the object and
its reflection. The back edge of the gobo can
be seen when looking through the uncoated
side.
5
2
4
3
1
7
red
green
blue
UV
3
5
4
Color/gobo wheel
6
19