Clay Paky Alpha Spot HPE 1200 Manuel d'utilisateur télécharger pdf (Page 3)

January 2006 •

Lighting&Sound

America

TECHNICAL FOCUS : PRODUCT IN-DEPTH

colors, but, because of the offset positioning of the wheel in the

packed optical compartment, the transition line between colors is

slightly oblique and varies a little as you rotate the wheel (Figure 8:

Half colors). The dichroics are close together and there is little or no

black transition bar between the colors.

There is a good choice of colors, with a nice clean red and a

good orange—always a tough color to get with a mixing system.

Color change speed was good—not the fastest I’ve seen, but

crisp and definite.

Through the menuing system, you can select various modes of

operation for the color wheel—for example, you can choose if the

wheel can rotate continuously or if it will “jump” between full and

half-colors. Noteworthy here is the very slow wheel-rotate speed

possible—it’s so slow as to be almost imperceptible. Another menu

option is to use quick-path, so the direction of wheel movement

always gives you the fastest change possible.

Gobos

The Alpha Spot 1200HPE has three gobo wheels—the first and last

contain six rotating patterns plus open hole, while the center wheel

contains eight fixed patterns. Clay Paky has tried to make it as easy

as possible to access and change the gobos. For example, one of

the lamp fans flips up on a spring to give clear access to the

rotating gobo wheels (Figure 9: Fan flips up for access to gobos)

and the rotating gobos snap in and out very easily with no

requirement for tools (Figure 10: Snap-in gobos).

Most noteworthy is the system used for the fixed wheel—to

change the gobos, you need to remove the whole wheel. This could

be a real problem, so Clay Paky has tried to make it easy by

attaching the wheel with a magnetic hub (Figure 11: Fixed gobo

wheel with magnetic hub attachment). To remove the wheel, you

just snap it away from the center magnet and slide it out. Putting it

back is a little trickier, as you need to ensure the ident hole is

correctly installed over the locating pin on the hub. It takes a little

practice to get right, but, once mastered, it’s a neat technique.

Indexing and wheel-positioning accuracy on the rotating gobos

was a little weak. Measured hysteresis error was around 0.4°, which

is approximately 1.5” at a 20’ throw. Wheel positioning was not

quick-path-enabled, resulting in the relatively slow, 1.5 seconds of

movement from Gobo 1 to Gobo 6.

As with the fixed color wheel, it is possible to select an extremely

slow gobo-rotation speed—this rotation is smooth and clean. Clay

Paky has chosen to populate Rotating Gobo Wheel 2 primarily with

effects glasses—however, it is possible to use and focus on

standard patterns as well. I did have a problem with Rotating Gobo

Wheel 1—if you are in narrow zoom (less than 20%) then you can’t

focus on this wheel at throws less than 20’. Wheel 2 does not have

this problem, so this might help determine which wheel you should

use depending on your particular rig layout.

The fixed gobo wheel had a little bounce when coming to a halt

but otherwise performed well. The open aperture on this wheel is a

little too large, as you can see a sliver of it when positioned on the

adjacent Patterns 1 or 8. You can work around this by closing the

iris slightly. [Note: Clay Paky reports that the software has been

adjusted to address this problem in current production units.] Fixed

gobo change is quick-path-enabled ,helping achieve the very

respectable gobo change times reported.

The big change here for Clay Paky with ellipsoidal optics is the

ability to effectively morph between gobos. The Alpha spot performs

this effect well—Figure 12 shows a morph sequence between the

Fixed Gobo

Gobo change time, adjacent apertures 0.25 sec

Gobo change time, max (Gobo 0 to 4) 0.5 sec

Maximum wheel spin speed 1.5 sec/rev = 40 rpm

Minimum wheel spin speed 65 sec/rev = 0.9 rpm

Rotating Gobos (Gobo 1 and Gobo 2)

Gobo change time, adjacent apertures 0.65 sec

Gobo change time, max (Gobo 0 to 3) 1.5 sec

Maximum gobo rotate speed 0.5 sec/rev = 120 rpm

Minimum gobo rotate speed 1080 sec/rev = 0.056 rpm

Color Wheel

Color change speed – adjacent 0.3 sec

Color change speed – worst case 0.6 sec (quick-path enabled)

Maximum wheel spin speed 0.3 sec/rev = 200 rpm

Minimum wheel spin speed 410 sec/rev = 0.15 rpm

Color Wheel

Color Red Yellow Violet Green Orange Blue

Transmission 7.2% 62% 23% 34% 14% 33%

Fig. 8: Half colors

Fig. 9: Fan flips up for access to gobos

Fig. 10: Snap-in gobos

Fig. 11: Fixed gobo wheel with

magnetic hub attachment

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Clay Paky Alpha Spot HPE 1200 Manuel d'utilisateur Page 3

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