Martin MAC 2000 Performance II User Manual page 32

G o b o s p e c i f i c a t i o n s
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.
O r i e n t a t i o n
G
LASS 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.
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.
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.
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Coated side
Figure 12: Finding the coated side
MAC 2000 Performance II
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.