Using your Solar Filter

Solar observing is one of the most rewarding forms of celestial observations. Yet, because the Sun is so bright, special precautions must be taken to ensure your safety and protect your equipment. Therefore, read these instructions through

completely BEFORE you attempt to use your solar filter.

A Word of Caution

Never look through the StarPointer finderscope when pointed at the Sun.

About the Filter

The Celestron AstroSolar™ solar filter by Baader allows direct observations of the Sun in complete safety. The filter, which transmit .00001% of the Sun’s visible light, allows you to see the outer atmosphere of the Sun including such features as sunspots, granules and faculae. The material used to make these filters is a precision engineered, high-strength polymer that is ion implanted and metallized with a tough, neutral color layer on both sides of the film.

The Appearance

One of the first things you may notice when you remove your solar filter from the box is that the film is slightly wrinkled. This is the way the filter is supposed to look. The best resolution is obtained when the material is slightly relaxed or wrinkled.

Installation and Use

Before installing the solar filter, you should always inspect the surface of the filter for holes or other damage. To inspect the filter, hold it up to a bright light source (other than the Sun) like a white wall reflecting sunlight or a patch of blue sky away from the sun. Look for any light that may be passing through the filter. If any light is visible, the filter should NOT be used.

To install the filter, point your telescope away from the Sun and remove the lens cap. Now, place the solar filter over the front lens or opening of the telescope. Push the filter cell until the inside of the filter cell is flush against the end of the tube. The filter should be tight enough so that it will NOT fall off when the telescope is pointed toward the ground.

Filter Cell

AstroSolar Filter Material

Figure 2-7 – Solar Filter

Once the solar filter is securely in place you are ready for your first look. To do so, point the telescope in the general direction of the Sun. Now, look at the shadow of

the telescope tube, which will indicate how close you are to the Sun. Look closely at the shadow cast by the StarPointer finderscope. When you see light shining through the StarPointer’s sight tube you are approaching the Sun. The more elongated the light, the farther away from the Sun you are pointing. When the light is circular, you should be pointing directly at the Sun. Look through a low power eyepiece to see if the solar image is there. If not, slowly sweep around until the sun comes into the field.

Cleaning and Storage

To clean the filter, use a photographic cleaning brush to remove dust and other debris. Never rub the filter. Be sure that when handling your solar filter not to touch the filter itself. When not in use, store your filter in its box. Place the box in a dry, warm environment that is relatively dust free. Moisture on the filter can and will degrade the performance. Do not use the filter if AstroSolar film is punctured in any way.

For tips on viewing the Sun through your filter, see the Celestial Observing section of this manual.

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Celestron 80GTL manual Using your Solar Filter, About the Filter, Appearance, Installation and Use, Cleaning and Storage
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80GTL specifications

The Celestron 80GTL is a powerful and compact telescope designed for both amateur astronomers and experienced stargazers. It combines modern technology with user-friendly features, making it an excellent choice for those looking to explore the night sky. With its 80mm aperture, the 80GTL captures enough light to reveal a variety of celestial objects, from the moon’s craters to distant galaxies.

One of the standout characteristics of the Celestron 80GTL is its innovative Altazimuth mount. This mount provides smooth and precise movements in both horizontal and vertical directions, allowing users to easily track celestial objects as they move across the sky. The setup is quick and straightforward, making it ideal for beginners who may be intimidated by more complex mounts.

The telescope is equipped with Celestron’s StarScope system, which includes a computer-controlled GoTo mount. This feature allows users to automatically locate and track over 40,000 celestial objects with the push of a button. The included hand controller is intuitive and easy to navigate, giving users instant access to stars, planets, and deep-sky objects. This technology not only enhances the viewing experience but also helps novice astronomers learn about the universe with guided tours through the night sky.

Another notable feature of the Celestron 80GTL is its sturdy construction and lightweight design. Made from high-quality materials, it boasts durability while remaining portable for easy transport. Weighing just under 10 pounds, this telescope can be taken on camping trips or excursions, allowing users to enjoy astronomy in various locations.

Additionally, users will appreciate the 80GTL’s fully coated glass optics which provide excellent image quality and contrast. The included 25mm and 10mm eyepieces offer different magnifications, catering to diverse viewing preferences. Whether observing the rings of Saturn or the detail of lunar landscapes, the 80GTL promises clear and sharp images.

In summary, the Celestron 80GTL is a highly capable telescope, combining an accessible design with advanced technologies. Its user-friendly GoTo mount, quality optics, and lightweight build make it an exceptional option for anyone wishing to delve into the wonders of the cosmos, ensuring both enjoyment and education in the field of astronomy.
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