Bushnell 78-2100 Instruction Manual

Pages 2

Year 2002

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Bushnell 78-2100 Scope Specification

The Bushnell 78-2100 Scope is engineered to provide exceptional optical performance for astronomy enthusiasts and casual stargazers alike. This model features a 60mm aperture that allows for substantial light-gathering capability, essential for clear and bright images of celestial bodies. Its refractor design ensures minimal maintenance and durability, offering a long-lasting observational tool. The focal length of 700mm achieves a focal ratio of f/11.7, which strikes a balance between magnification and clarity, reducing chromatic aberration for sharper images.

Equipped with a standard 1.25-inch eyepiece compatibility, the 78-2100 model supports a wide range of aftermarket eyepieces, enhancing its versatility. The package includes a 20mm eyepiece and a 4mm eyepiece, enabling varied magnification levels to suit different observational needs. It also comes with a 3x Barlow lens, effectively tripling the magnification power of the eyepieces, allowing for detailed views of planets and other distant celestial objects.

The scope is mounted on a sturdy altazimuth mount, providing smooth manual tracking of objects across the night sky. This mount is complemented by a slow-motion control rod, which assists in making precise adjustments for tracking celestial objects. The design incorporates a lightweight and portable build, making it suitable for both home use and transport to remote, low-light locations. The Bushnell 78-2100 Scope is designed to be user-friendly, making it an ideal choice for beginners while offering sufficient features to satisfy experienced users seeking a reliable and effective entry-level telescope.

Bushnell 78-2100 Scope F.A.Q.

How do I properly align the Bushnell 78-2100 Scope for accurate viewing?

Start by setting up your telescope on a stable surface. Use the finderscope to locate a bright star or distant object. Adjust the altitude and azimuth controls to center the object in the viewfinder. Then, use the eyepiece to fine-tune your focus until the image is sharp.

What should I do if the image through the telescope appears blurry?

Ensure the eyepiece is securely attached and clean from dust and smudges. Adjust the focus knob slowly to achieve clarity. If issues persist, check whether the telescope’s optics need collimation or if environmental factors like humidity are affecting visibility.

How can I maintain the cleanliness of my Bushnell 78-2100 Scope?

Use a soft, lint-free cloth to wipe down the exterior. For lenses, use a lens brush or blower to remove loose particles, then gently clean with a lens cleaner and microfiber cloth. Avoid touching the lenses with your fingers to prevent smudges.

How can I troubleshoot alignment issues with my telescope?

First, ensure the telescope is on level ground. Check that the tripod is stable and the mount is securely attached. Use the finderscope to realign with a known object and adjust the screws on the mount to fine-tune the alignment.

What are the best conditions for using the Bushnell 78-2100 Scope?

For optimal viewing, use the telescope on clear nights away from city lights to reduce light pollution. Avoid using the telescope in humid conditions as it can cause dew to form on the lenses.

Can I use the Bushnell 78-2100 Scope for terrestrial viewing?

Yes, the Bushnell 78-2100 can be used for terrestrial viewing. Use a low-power eyepiece for wider views and ensure the scope is securely mounted. Adjust the focus as necessary for sharp terrestrial images.

What should I do if the telescope mount becomes loose?

Check the screws and bolts on the mount for tightness and tighten if necessary. Avoid over-tightening as it can damage the mount. Regularly inspect the tripod for wear and tear to ensure stability.

How can I improve the stability of my telescope during use?

Ensure the tripod legs are fully extended and locked. Position the telescope on firm ground, and if windy, consider adding weights to the tripod for additional stability.

Why is it important to let the telescope acclimate to outdoor temperatures?

Allowing the telescope to acclimate prevents thermal currents inside the optical tube, which can distort images. Set up the telescope outside at least 30 minutes before observing to match the ambient temperature.

How often should I check the collimation of my Bushnell 78-2100 Scope?

Check collimation every few months or if you notice a decline in image quality. Collimation can be affected by transportation or long-term storage. Follow the manual for specific collimation instructions.