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This ground-breaking telescope has many unique features.
One of the most visually dramatic is the large filter design
at the back of the telescope. |
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The use of a large diameter filter means the air flow
the fans take in is restricted far less than traditional methods.
This is due to the filter's enormous surface area. |
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The high volume, low vibration and low noise fans
pump large volumes of air into this telescope. They not only
allow the both cellular mirrors to follow ambient temperatures
far more rapidly but they also push air past the secondary mirror.
The latter is typically the first optic to face dew issues. |
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Another unique advantage of the Dream Filtered Air
System is that it fills the telescope tube with clean air. It
is like having the benefits of a closed optical system without
the thermal penalties. Optics stay prestine for long periods
of time. This reduces the number of optical cleanings required,
helps maintain higher reflectivity and also prevents insects,
such as spiders, from entering the interior of the telescope. |
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These fans are very efficient, using less than 10
watts altogether. |
