VISUAL OBSERVING INFORMATION

Focusing

When working with any optical instrument, there are several focusing hints that will ensure that you get the sharpest possible image. The hints listed here are for visual observing and photography.

S￿ Never look through glass. Glass found in household windows is optically imperfect and may vary in thickness from one location to the next. This inconsistency can and will affect the ability to focus your spotting scope. In most cases, you will not be able to achieve a truly sharp focus. In some cases, you may actually see a double image.

S￿ Avoid looking across or over objects that are producing heat waves. This includes asphalt parking lots on hot summer days or building rooftops. The turbulent air caused by these conditions makes it impossible to get a truly sharp focus.

S￿ Avoid hazy skies, fog, and mist, all of which can make it difficult to focus, thus greatly reducing the amount of detail seen. Remember that no matter how good the optics of your instrument are, they can NOT perform to their fullest under adverse conditions.

Calculating Magnification (Power)

You can change the magnification of your spotting scope simply by changing the eyepiece (also called an ocular). To determine the magnification with your spotting scope, simply divide the focal length of your spotting scope by the focal length of the eyepiece. In equation format, the formula looks like this:

Focal Length of Spotting Scope (mm)

Magnification = ___________________________________________________

Focal Length of Eyepiece (mm)

For example, to determine the magnification of the 102mm Wide View with a 25mm eyepiece, divide the focal length of the 102mm Wide View (500mm) by the focal length of the eyepiece (25mm). 500 divided by 25 yields 20 power.

Although the power is variable, each instrument has a limit to the highest useful magnification. The general rule is that 60 power can be used for every inch of aperture. For example, in a 4” diameter spotting scope, such as the 102mm Wide View, the maximum useful magnification is 240 power. This is derived from multiplying 60 times 4”. Although this is the maximum useful magnification, most observing is done in the range of 20 to 35 power for every inch of aperture which for the 102mm Wide View is 80 to 140.

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Celestron 52270, 52260 instruction manual Visual Observing Information, Focusing, Calculating Magnification Power
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52270, 52260 specifications

Celestron, a leading manufacturer in the field of telescopes and astronomy equipment, has consistently delivered top-notch products tailored for both amateur enthusiasts and seasoned astronomers. Among its impressive lineup are the Celestron 52260 and Celestron 52270 models, known for their exceptional performance and user-friendly features.

The Celestron 52260, commonly referred to as the Astromaster 70AZ telescope, is an ideal choice for beginners. It features a 70mm aperture that provides bright and clear images of celestial objects, making it perfect for viewing the moon, planets, star clusters, and nebulae. The telescope's simple, lightweight design ensures easy portability and quick setup, allowing users to take it virtually anywhere. It comes with a StarPointer finderscope that assists in locating objects in the night sky with ease.

The Celestron 52270, also known as the Astromaster 90AZ telescope, boasts a 90mm aperture, which offers even clearer and more detailed views of distant astronomical wonders. This model enhances the viewing experience with its superior light-gathering capabilities, delivering sharper images. Like its counterpart, the 52270 features an adjustable aluminum tripod, providing a stable platform for observations.

Both telescopes incorporate Celestron's premium optics, including fully coated glass optics that maximize light transmission and reduce glare. Furthermore, they are designed with an easy-to-use Altazimuth mount, facilitating smooth movement in both horizontal and vertical directions. This feature enables users to track celestial objects with precision, making the observing experience enjoyable and hassle-free.

Another notable characteristic of both models is their adaptability; the telescopes are compatible with various 1.25" eyepieces, allowing users to enhance their viewing options and customize their observations. Additionally, they are equipped with the Celestron's innovative SkyX software, which provides a comprehensive database of celestial objects, aiding both novice and advanced stargazers in their explorations.

In summary, the Celestron 52260 and 52270 telescopes are exemplary choices for anyone looking to delve into the universe of astronomy. With their robust features, user-friendly designs, and exceptional optical performance, these models serve as excellent entry points for individuals eager to explore the wonders of the night sky. Whether for casual stargazing or deeper astronomical pursuits, Celestron's commitment to quality and innovation makes their telescopes a valuable asset for any skywatcher.
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