User manual

Optical configuration 31
Gobo specifications
All gobo slots accept round theatrical size-E glass gobos. 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.
For the best results, custom glass gobos that meet the following criteria should be used:
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
Although glass gobos are generally the most durable, satisfactory results can be obtained in many
applications at less expense with aluminum gobos. Our experience with the MAC 2000 Performance II,
which is supplied with aluminum gobos, shows that aluminum can hold up to the heat very well. Custom
stainless steel gobos can also be used, however they can warp, losing sharpness, in a matter of hours in the
MAC 2000 Performance II. The useful life will depend on the gobo pattern and the projection cycle. Consult
your gobo supplier for more information.
Orientation
GLASS GOBOS
Coated glass 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.
M
ETAL GOBOS
For correct projection, install metal custom gobos with the true image facing the lamp. The false-image side
(which faces away from the lamp) should be coated with a suitable high-temperature black paint to reduce
reflections.
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.
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.
Figure 8: Finding the coated side
Coated side
Uncoated side