Attaching the Accessories

2.Mount the finderscope bracket (#4) by mounting the bracket over the studs protruding from the tube and tightening it down with the supplied nuts.

3.Slide the rubber O-ring over the eyepiece end of the finderscope and roll it 2/3 of the way up the finderscope.

4.Insert the eyepiece end of the finderscope through the bracket until the O-ring presses tightly between the finder and the inside of the bracket.

5.Tighten the three adjustment screws until they make contact with the finderscope body.

The finderscope is now installed and only needs to be aligned before it is used.

Figure 4

In order to use your telescope there are some standard accessories which must first be installed: The installation of each is described

1 ¼" Diagonal (for #21077 & #21016): Loosen the thumb screw on the eyepiece holder located on the focuser draw tube. Slide the smaller end of the diagonal (without the thumb screw) into the focuser tube. Tighten the thumb screw to hold the diagonal in place.

Ocular: Loosen the thumb screw on the eyepiece holder (or 1 ¼" diagonal for #21077 & #21016). Slide the barrel of the eyepiece into the eyepiece holder and tighten the thumb screw to hold the eyepiece in place.

Aligning the Finderscope

Accurate alignment of the finderscope makes it easy to find objects with the telescope, especially celestial objects. To make aligning the finderscope as easy as possible, this procedure should be done in the daytime when it is easy to find and identify objects. To align the finder:

1.Choose a target that is in excess of one mile away. This will eliminate any possible parallax effect between the telescope and finderscope.

2.Point the telescope at your target and center it in the main optics of the telescope. You may have to move the telescope slightly to center your target.

3.Adjust the screws on the finderscope bracket, tightening one while loosening another, until the cross hairs are centered on the target seen through the telescope.

4.Tighten the lock nuts to secure the position of the finderscope.

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.

Celestron 91510 instruction manual Attaching the Accessories, Aligning the Finderscope

Models: 91510