a.

 

b.

 

 

 

c.

 

d.

 

 

 

Figure 5. Proper operation of the equatorial mount requires that the telescope tube be balanced on both the R.A. and Dec. axes. (a) With the R.A. lock lever released, slide the counterweights along the counterweight shaft until they just counterbalance the tube. (b) When you let go with both hands, the tube should not drift up or down. (c) With the Dec. lock lever released, loosen the tube ring lock clamps a few turns and slide the telescope forward or back in the tube rings.

(d) When the tube is balanced about the Dec. axis, it will not move when you let go.

2.Now loosen the counterweight lock thumbscrews and slide the weights along the shaft until they exactly coun- terbalance the telescope (Figure 5a) That’s the point at which the shaft remains horizontal even when you let go with both hands (5b).

3.Retighten the counterweight lock thumbscrews. The tele- scope is now balanced on the R.A. axis.

4.To balance the telescope on the Dec. axis, first tighten the R.A. lock lever, with the counterweight shaft still in the hor- izontal position.

5.With one hand on the telescope optical tube, loosen the Dec. lock lever. The telescope should now be able to rotate freely about the Dec. axis. Loosen the tube ring clamps a few turns, until you can slide the telescope tube forward and back inside the rings (this can be aided by using a slight twisting motion on the optical tube while you push or pull on it) (5c).

6.Position the telescope in the mounting rings so it remains horizontal when you carefully let go with both hands. This is the balance point for the optical tube with respect to the Dec. axis (5d).

7.Retighten the tube ring clamps.

The telescope is now balanced on both axes. Now when you loosen the lock lever on one or both axes and manually point the telescope, it should move without resistance and should not drift from where you point it.

4. Aligning the Finder Scope

A finder scope has a wide field of view to facilitate the loca- tion of objects for subsequent viewing through the main telescope, which has a much narrower field of view. The find- er scope and the main telescope must be aligned so they point to exactly the same spot in the sky.

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Orion 120 EQ instruction manual Aligning the Finder Scope
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120 EQ specifications

The Orion 120 EQ telescope is a testament to modern astronomy, designed to provide both novice stargazers and seasoned astronomers with an exceptional viewing experience. With a 120 mm aperture, this telescope offers a bright and clear image, making it ideal for observing celestial objects such as the Moon, planets, and deep-sky wonders.

One of the standout features of the Orion 120 EQ is its optical design. The telescope uses a robust refractor setup, which is renowned for delivering high-quality images with minimal distortion. The fully coated optics enhance light transmission, ensuring that the views are not only bright but also rich in detail. This is particularly beneficial when exploring intricate lunar craters or the rings of Saturn.

The 120 EQ comes equipped with a sturdy equatorial mount that simplifies the tracking of celestial objects as they move across the night sky. With its smooth movements and precise adjustments, users can easily keep their target in sight, making it an excellent choice for astrophotography enthusiasts and visual observers alike. The mount also features a built-in polar scope, aiding in accurate alignment for observers in various geographic locations.

Additionally, the Orion 120 EQ includes high-quality eyepieces that maximize the telescope's optical capabilities. With different magnification options, users can switch between wide field views and detailed close-ups, making it versatile for various types of astronomical observation. The eyepieces are designed for comfort and ease of use, allowing for extended viewing sessions without causing strain.

Portability is another key characteristic of the Orion 120 EQ. Despite its robust performance, the telescope is relatively lightweight and can be easily transported to dark-sky locations, which is crucial for avoiding light pollution and enhancing the viewing experience. Its compact design ensures that it can fit into most car trunks, making it an ideal companion for astronomy outings.

The ease of setup is also noteworthy. The Orion 120 EQ is designed with user-friendliness in mind, enabling both beginners and experienced users to get started with minimal effort. The included user manual provides helpful tips and guidance, making it simple to start exploring the night sky in no time.

In summary, the Orion 120 EQ is a remarkable telescope that combines quality optics, a dependable equatorial mount, and user-friendly features. Whether you're just starting your astronomy journey or are looking to enhance your existing collection, the Orion 120 EQ provides the necessary tools to explore and appreciate the wonders of the universe. Its performance, portability, and ease of use truly set it apart in the world of amateur astronomy.
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