Before you attach the optical tube, make sure that the declination and right ascension clamps are tight. The optical tube attaches to the mount via two rings that are mounted on the tube of the telescope. To mount the telescope tube:

1.Loosen the knobs on the side of the rings. This will allow you to slide the mounting rings the length of the optical tube.

2.Locate the two screws on either end of the platform for the optical tube (#8).

3.Hold the telescope up to the mount and slide the mounting rings until they are over the screws on the mounting platform.

4.Place the flat portion of the ring over the mount so that the hole in the ring is over the screw protruding out of the mounting platform.

5.Tighten the knobs underneath the mounting platform to secure the rings.

6.Tighten the knobs on the side of the mounting rings to prevent the telescope from sliding forward or backward. These can be loosened later to reposition the telescope during the balancing process.

Balancing the Telescope

To eliminate undue stress on the mount, the telescope should be properly balanced around the polar axis. In addition, proper balancing is crucial for accurate tracking if using a clock drive. To balance the mount:

1.Release the R.A. Clamp and position the telescope off to one side of the mount (see figure 2a).

2.GRADUALLY release the telescope to see which way it “rolls.”

3.Loosen a counterweight lock screw and slide the counterweight to a point where it balances the scope (i.e., the telescope remains stationary when the R.A. clamp is released).

4.Tighten the counterweight lock screw.

The scope is properly balanced in right ascension.

Figure 2a

Figure 2b

The telescope should also be balanced in declination to prevent any sudden movement when the Declination clamp is released. To balance the telescope in Declination:

1.Release the R.A. clamp and rotate the telescope so that it is on one side of the mount (i.e., as described above for balancing the mount in R.A.).

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Celestron 91510 instruction manual Balancing the Telescope, Scope is properly balanced in right ascension
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91510 specifications

The Celestron 91510 is a remarkable telescope that offers astronomy enthusiasts a blend of quality, portability, and advanced features, making it a popular choice for both beginners and seasoned stargazers alike. Known for its impressive optics, the Celestron 91510 utilizes a 70mm refractor design that provides bright and clear images, ideal for observing celestial objects such as planets, stars, and deep-sky phenomena.

One of the standout features of the Celestron 91510 is its fully coated optics, which enhance light transmission and improve image quality. This ensures that users can observe fine details in celestial bodies, such as the rings of Saturn or the craters on the Moon. The telescope comes with two eyepieces of different focal lengths, allowing for varying magnification. This versatility enables users to explore the night sky with ease, offering both wide-field views of star clusters and higher magnification for detailed observations.

Portability is another significant advantage of the Celestron 91510. Designed with travel in mind, this telescope is lightweight and compact, making it easy to set up and transport. It features a sturdy yet portable mount that provides stable support during observations. The pan-and-tilt head allows for smooth tracking of celestial objects, ensuring that users can focus on their targets without hassle.

Moreover, the telescope includes a red dot finder which aids in locating objects quickly in the night sky. This user-friendly feature is especially beneficial for beginners who may find it challenging to navigate the stars. The adjustable tripod provides a stable base and can be set to various heights, ensuring comfort during extended viewing sessions.

Celestron's commitment to quality and innovation is evident in the design of the 91510. It incorporates durable materials that withstand the rigors of outdoor use, ensuring longevity. Additionally, the telescope's overall aesthetic appeal, complete with a sleek design, adds to the enjoyment of using this astronomical instrument.

In summary, the Celestron 91510 is an excellent choice for anyone looking to delve into the wonders of astronomy. With its high-quality optics, user-friendly features, and portability, it offers an enjoyable stargazing experience. Whether you are a novice wanting to explore the cosmos or an experienced astronomer seeking a reliable companion, the Celestron 91510 stands out as an exceptional option.
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