Configuring The Optical System ( Mac 250 Only) - Martin MAC 250+ User Manual

C o n f i g u r i n g t h e o p t i c a l s y s t e m ( M AC 2 5 0 o n l y )
B e a m a n g l e o p t i o n s
The standard MAC 250 lens system can be configured for 4 beam angles ranging from 12.1° to 23.3°. The beam angle
in the default 4-lens configuration is 17.5°. Other beam angles are achieved by removing lenses and positioning the
dimmer module as shown below. Note: dimming will be somewhat less even in the 12.1° configuration.
To calculate the projected size of an image, divide the gobo's image diameter by the focal length and then multiply by
the distance in meters.
12.1°
2
Beam Angle
C h a n g i n g b e a m a n g l e
Verify that lenses and retention springs are fully seated.
1. Disconnect the fixture from AC power and allow it to cool.
2. Remove the top head shell as shown in Figure 5.
3. Remove and/or replace lenses as required.
To remove lens 1, first remove lens 2 as described next. Then pull out the retention spring for lens 1
and tilt the module or head until the lens drops out. Catch it in a soft cloth. Store the lens together
with the spring in a safe place. Replace lens 2 and the module(s).
To remove lens 2, remove either the color/gobo/focus module or the dimmer and prism modules as
described below. Pull out the retention spring for lens 2 and tilt the module or head until the lens
drops out. Catch it in a soft cloth. Store the lens together with the spring in a safe place. Replace the
module(s).
To remove lens 3, pull the lens clip back. Tilt the head until the lens drops out and catch it with a soft
cloth. Store the lens together with the spring in a safe place.
4. Move the dimmer module to the forward or rear position as indicated in Figure 9. Make sure as you
position the module that the bottom sits between the guide pins in the bottom shell. Pull the locking
pins up and then snap them down to lock.
5. Replace the head cover. Position the holes by the lens opening over the nipples and check that all
wires are inside the head as you lower the cover into place. Push the locking pins in with a flat-tip
screwdriver and turn them clockwise until they lock (1/2 turn).
14.6°
3 4 1
Figure 9: MAC 250 optical configurations
Focal Length
12.1° 80.2 mm
14.6° 66.3 mm
17.5° 55.2 mm
23.3° 41.2 mm
Table 6: MAC 250 optical configurations
3 4 1 2
Remove Lens
1 (40 mm)
2 (50 mm)
3 (60 mm)
Basic Service
17.5°
3 4 1 2
Dimmer Position
-
23.3°
4
forward
forward
rear
rear
17