A telescope is an instrument that collects and focuses light. The nature of the optical design determines how the light is focused. Some telescopes, known as refractors, use lenses. Other telescopes, known as reflectors, use mirrors. The NexStar 60, 80 and 102 telescopes are refractor telescopes that use an objective lens to collect its light. The NexStar 114 and 130 are reflecting telescopes with a primary and secondary mirror to gather and focus light.

Focusing

Once you have found an object in the telescope, turn the focusing knob until the image is sharp. To focus on an object that is nearer than your current target, turn the focusing knob toward the eyepiece (i.e., so that the focusing tube moves away from the front of the telescope). For more distant objects, turn the focusing knob in the opposite direction. To achieve a truly sharp focus, never look through glass windows or across objects that produce heat waves, such as asphalt parking lots.

Image Orientation

The image orientation of any telescope changes depending on how the eyepiece is inserted into the telescope. When observing through the NexStar 60, 80 or 102 using the diagonal, the image will be right side up, but reversed from left to right. When observing straight through, with the eyepiece inserted directly into the telescope, the image will be inverted.

Reversed from left to right, as viewed with a Star Diagonal

Inverted image, as viewed with the eyepiece directly in telescope

When observing through the NexStar 114 or 130, a reflecting telescope, the image will reversed (mirror image) when looking through the eyepiece.

For astronomical viewing, out of focus star images are very diffuse, making them difficult to see. If you turn the focus knob too quickly, you can go right through focus without seeing the image. To avoid this problem, your first astronomical target should be a bright object (like the Moon or a planet) so that the image is visible even when out of focus.

Calculating Magnification

You can change the power of your telescope just by changing the eyepiece (ocular). To determine the magnification of your telescope, simply divide the focal length of the telescope by the focal length of the eyepiece used. In equation format, the formula looks like this:

Focal Length of Telescope (mm)

Magnification = ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

Focal Length of Eyepiece (mm)

Let’s say, for example, you are using the 25mm eyepiece. To determine the magnification you simply divide the focal length of your telescope (for example, the NexStar 114 has a focal length of 1000mm) by the focal length of the eyepiece, 25mm. Dividing 1000 by 25 yields a magnification of 40 power.

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Nexstar 80, 60, 102, 130, 114 manual Focusing, Reversed from left to right, as viewed with a Star Diagonal
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60, 130, 80, 102, 114 specifications

The Nexstar series telescopes, including the Nexstar 114, 102, 80, 130, and 60 models, represent a significant advancement in amateur astronomy, offering a blend of portability, user-friendly design, and advanced technology. Each model is uniquely tailored to cater to different levels of enthusiasts, from beginners to more experienced stargazers.

The Nexstar 114 boasts a 114mm aperture and a focal length of 1000mm, making it ideal for detailed views of planets and deep-sky objects. Its reflector design allows for higher light gathering capability, ensuring bright and clear images. The telescope features a computerized GoTo mount, allowing users to locate and track celestial objects with ease. Its ergonomic design and lightweight build emphasize portability, making it a great choice for both backyard and remote observing.

Next in the lineup is the Nexstar 102, equipped with a 102mm aperture. This refractor telescope is known for its exceptional color correction and crisp images, particularly for planetary viewing. The 102 is user-friendly, with a sturdy mount and easy setup that appeals to newcomers. Its computerized tracking system simplifies locating celestial bodies, enhancing the observing experience.

The Nexstar 80, with its 80mm aperture, is incredibly compact and travel-friendly, perfect for those who want to explore the night sky on the go. Despite its size, it provides impressive views of the moon and bright planets. The telescope offers a lightweight design and quick setup features, making it an excellent starter telescope for kids and casual stargazers.

For those seeking a larger aperture, the Nexstar 130 features a 130mm aperture that delivers stunning views of a variety of celestial objects. With a focal length of 650mm, this compact telescope excels in observing both planets and deep-sky objects. Its GoTo mount provides automated tracking, making it a favorite among intermediate users who desire a bit more capability without extensive setup.

Finally, the Nexstar 60 is an entry-level model that combines affordability with efficiency. With a 60mm aperture, it’s lightweight and extremely portable, perfect for casual observations. It’s equipped with a simple mount and straightforward controls, making it an ideal choice for children or those new to astronomy.

Overall, the Nexstar series telescopes are designed with advanced optics, computerized mounts, and user-friendly interfaces, making them suitable for a wide range of users, from novices to more experienced astronomers. Whether you are looking for ease of portability or more advanced features, there is a Nexstar model tailored to meet your needs and enhance your stargazing experience.
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