Bushnell 78-3576 Instruction Manual

Pages 15

Year 2005

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Bushnell 78-3576 Telescope Specification

The Bushnell 78-3576 Telescope is a robust entry-level instrument designed to offer a balance between quality optics and user-friendly features, making it ideal for amateur astronomers. This refractor telescope boasts a 60mm aperture, providing sufficient light-gathering capability to observe celestial objects such as the moon, planets, and some deep-sky phenomena. It features a 700mm focal length, resulting in a focal ratio of f/11.7, which is well-suited for detailed planetary observations and delivers crisp, clear images with minimal chromatic aberration.

The telescope is equipped with a sturdy altazimuth mount, allowing smooth horizontal and vertical adjustments for easy tracking of celestial bodies. Its adjustable aluminum tripod provides stable support and can be tailored to various observer heights, enhancing viewing comfort. The Bushnell 78-3576 comes with interchangeable 4mm and 12.5mm eyepieces, offering different magnification levels to accommodate diverse observational needs. A 3x Barlow lens is also included, effectively tripling the magnification power of the eyepieces, thus enhancing the viewing experience.

With a built-in erect image diagonal, the telescope can be used for both astronomical and terrestrial observations, presenting images in the correct orientation. The device includes a finderscope, aiding in the location and centering of objects within the main optical tube. Additionally, its lightweight and portable design make it easy to transport and set up at different observation sites. The Bushnell 78-3576 Telescope combines practical features with reliable performance, making it an excellent choice for beginners seeking to explore the night sky.

Bushnell 78-3576 Telescope F.A.Q.

How do I properly align the finderscope on my Bushnell 78-3576 telescope?

To align the finderscope, first choose a distant object during the day, like a tree or a sign. Center it in the main telescope's eyepiece, then adjust the finderscope's alignment screws until the object is centered in its crosshairs as well.

What should I do if the images in my telescope appear blurry?

Ensure that the telescope is properly focused using the focusing knob. Check if the lenses and eyepieces are clean and free from dust or smudges. Also, make sure that the telescope has reached thermal equilibrium with the outdoor temperature to reduce atmospheric distortion.

How can I maintain the optical quality of the Bushnell 78-3576 telescope?

Keep the telescope covered when not in use to prevent dust accumulation. Clean the lenses with a soft, lint-free cloth and use lens cleaning solution if necessary. Avoid touching the lenses with your fingers to prevent oil and smudges.

Why is my telescope not tracking objects properly?

Check that the telescope mount is securely assembled and balanced. Ensure that the tracking motor (if equipped) is functioning correctly and is set to the appropriate speed for celestial tracking.

How do I set up my Bushnell 78-3576 telescope for the first time?

Begin by assembling the tripod and mount. Attach the optical tube and secure it with the mounting screws. Install the finderscope, eyepiece, and any other accessories. Finally, align the finderscope and balance the telescope on its mount.

What eyepieces are compatible with the Bushnell 78-3576 telescope?

The Bushnell 78-3576 telescope typically uses 1.25-inch eyepieces. You can use any 1.25-inch eyepiece to change magnification levels, provided they are compatible with the telescope's focal length.

How do I clean the telescope's mirror or lens if it becomes dirty?

Remove loose dust with a blower bulb. If further cleaning is needed, use a soft, lint-free cloth slightly dampened with lens cleaning solution. Avoid disassembling the optical components unless absolutely necessary.

What is the best way to store my telescope when not in use?

Store the telescope in a dry, cool place. Keep it covered to protect it from dust. If possible, use a padded case or box to prevent physical damage. Avoid storing it in areas with high humidity to prevent mold growth on the optics.

Can I use my Bushnell 78-3576 telescope for astrophotography?

While the Bushnell 78-3576 is not specifically designed for astrophotography, it can be used for basic imaging. You may need additional adapters or a smartphone mount to attach a camera. Consider using a stable mount to reduce vibrations during long exposures.

How do I polar align my equatorial mount for the Bushnell 78-3576 telescope?

Locate Polaris, the North Star, and adjust the telescope's equatorial mount so that the polar axis points towards it. Use the mount's adjustment knobs to fine-tune the alignment. Accurate polar alignment is crucial for tracking celestial objects effectively.