How does the Starizona Cool Edge work on an 8" EdgeHD telescope?

On an 8" EdgeHD, the Cool Edge attaches to the front Fastar port. It pulls filtered air past the secondary mirror, down the main baffle, and across the primary mirror. The air then exits through the integrated vents in the telescope's rear cell, rapidly equalizing the temperature of the optics with the outside air and eliminating image-blurring tube currents.

Can I use the Cool Edge on a standard Celestron 8" SCT that isn't an EdgeHD?

Yes, provided your standard SCT is Fastar-compatible. The Cool Edge attaches to the secondary mirror assembly, which is removable on all Fastar scopes. To ensure proper airflow on a non-EdgeHD model, you must leave the visual back open (by removing the diagonal or any other accessory) to allow the air to exit the tube.

How long does the Cool Edge take to cool down my telescope?

The Cool Edge is designed for rapid stabilization, bringing your telescope's optics to ambient temperature in just a matter of minutes. The exact time depends on the starting temperature difference and the size of your telescope, but it is significantly faster than passive cooling.

What is the installation process for the Cool Edge?

Installation is straightforward and requires no tools: 1. Remove the secondary mirror: Carefully unthread your telescope's secondary mirror assembly from the corrector plate. 2. Attach the Cool Edge: Thread the Cool Edge cooler onto the corrector plate where the secondary was. 3. Reattach the secondary mirror: Thread the secondary mirror assembly onto the front of the Cool Edge unit. 4. Power on: Connect the appropriate power supply to begin cooling.

Will the Cool Edge help with imaging planets like Jupiter or Saturn?

Absolutely. High-resolution planetary imaging is extremely sensitive to thermal turbulence inside the optical tube. By eliminating tube currents, the Cool Edge provides a much steadier, sharper image, allowing you to resolve finer details like cloud bands on Jupiter or the Cassini Division in Saturn's rings.

Does the Cool Edge require an AC or DC power source?

The Starizona Cool Edge is available in different versions, each configured for either AC (wall outlet) or DC (field battery/power tank) power. You must select the appropriate power option for your intended use when purchasing.

Starizona Cool Edge - SCT Cooler

by Starizona

SKU STZ-COOL-HD8-AC

$189.00 USD - $189.00 USD

$189.00 USD

$189.00 USD - $189.00 USD

$189.00 USD

Price Match Policy!

Actively cools SCT optics to ambient temperature in minutes
Designed for Celestron EdgeHD and Fastar-compatible telescopes
Front-mounted design bypasses internal EdgeHD lens elements
Attaches easily to the secondary mirror holder (Fastar port)
Uses filtered air to prevent dust from entering the optical tube
Compact 4.0" diameter by 3.75" tall housing

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Starizona Cool Edge - SCT Cooler

The Starizona Cool Edge rapidly stabilizes your telescope's optics by eliminating internal tube currents, a critical step for achieving sharp, high-contrast views. This innovative front-mounted cooler, measuring a compact 4.0" in diameter by 3.75" tall, is the definitive thermal solution for Celestron's EdgeHD and other Fastar-compatible Schmidt-Cassegrain telescopes from 8" to 14" in aperture. By actively circulating filtered, ambient-temperature air through the optical tube, the Cool Edge ensures your mirror temperature matches the outside air in just minutes, preventing the image-degrading thermal plumes that can ruin an observing or imaging session.

Eliminating Tube Currents in 8" to 14" SCTs

The primary barrier to a sharp image in any SCT is the temperature difference between the primary mirror and the ambient air. As warm air rises off the mirror, it creates "tube currents"—thermals inside the optical tube that act like localized atmospheric seeing, blurring fine details on planets and softening star images. The Cool Edge is designed to solve this problem for a wide range of Celestron SCTs, with models available for 8", 9.25", 11", and 14" apertures.

Front-Mounted Cooling via the Fastar Port

Unlike traditional coolers that attempt to push air from the rear of the telescope, the Cool Edge works from the front. It attaches directly to the Fastar-compatible secondary mirror housing, a process as simple as installing a HyperStar lens. You simply unthread the secondary mirror, attach the Cool Edge, and then re-thread the secondary onto the cooler itself. This allows the unit to draw in ambient air and direct it down the baffle tube, creating a steady, laminar flow across the primary mirror.

A Compact 4.0" x 3.75" Filtered Air System

Measuring just 4.0" in diameter and 3.75" tall, the Cool Edge adds minimal obstruction or weight to the front of your telescope. The fan is housed within a durable body that includes an integrated filter. This is a critical feature, as it ensures that the air being pulled into your optical tube is free of dust, pollen, and other particulates, protecting your primary mirror and corrector plate from contamination during the cooling process.

Cool Edge vs. Rear-Cell Coolers: The EdgeHD Solution

While standard SCTs can use rear-mounted coolers, the Celestron EdgeHD design presents a unique challenge: its internal baffle tube contains lens elements that block airflow from the back. The Cool Edge was specifically engineered to overcome this limitation. It creates an airflow path that works in harmony with the EdgeHD design, pulling air in the front and exhausting it through the filtered rear-cell vents built into every EdgeHD optical tube. For non-EdgeHD Fastar scopes, the same airflow is achieved by simply leaving the visual back open, allowing the air to exit freely.
How does the Starizona Cool Edge work on an 8" EdgeHD telescope?

On an 8" EdgeHD, the Cool Edge attaches to the front Fastar port. It pulls filtered air past the secondary mirror, down the main baffle, and across the primary mirror. The air then exits through the integrated vents in the telescope's rear cell, rapidly equalizing the temperature of the optics with the outside air and eliminating image-blurring tube currents.

Can I use the Cool Edge on a standard Celestron 8" SCT that isn't an EdgeHD?

Yes, provided your standard SCT is Fastar-compatible. The Cool Edge attaches to the secondary mirror assembly, which is removable on all Fastar scopes. To ensure proper airflow on a non-EdgeHD model, you must leave the visual back open (by removing the diagonal or any other accessory) to allow the air to exit the tube.

How long does the Cool Edge take to cool down my telescope?

The Cool Edge is designed for rapid stabilization, bringing your telescope's optics to ambient temperature in just a matter of minutes. The exact time depends on the starting temperature difference and the size of your telescope, but it is significantly faster than passive cooling.

What is the installation process for the Cool Edge?
Installation is straightforward and requires no tools:
- 1. Remove the secondary mirror: Carefully unthread your telescope's secondary mirror assembly from the corrector plate.
- 2. Attach the Cool Edge: Thread the Cool Edge cooler onto the corrector plate where the secondary was.
- 3. Reattach the secondary mirror: Thread the secondary mirror assembly onto the front of the Cool Edge unit.
- 4. Power on: Connect the appropriate power supply to begin cooling.
Will the Cool Edge help with imaging planets like Jupiter or Saturn?

Absolutely. High-resolution planetary imaging is extremely sensitive to thermal turbulence inside the optical tube. By eliminating tube currents, the Cool Edge provides a much steadier, sharper image, allowing you to resolve finer details like cloud bands on Jupiter or the Cassini Division in Saturn's rings.

Does the Cool Edge require an AC or DC power source?

The Starizona Cool Edge is available in different versions, each configured for either AC (wall outlet) or DC (field battery/power tank) power. You must select the appropriate power option for your intended use when purchasing.
Dimensions 4.0" diameter x 3.75" tall

Compatibility Celestron EdgeHD & Fastar-Compatible SCTs (8", 9.25", 11", 14")

Power Options AC or DC versions available
- Cool Edge SCT Cooler
  
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Starizona Warranty

Starizona Cool Edge - SCT Cooler