EXPLORE SCIENTIFIC ES-ON20859RR Dobsonian 8-INCH F/5.9

( Brand: Explore Scientific ), ( Manufacturer Part Number: ES-ON20859RR ), ( Department: Men ), ( Type: Telescopes )

Review EXPLORE SCIENTIFIC 8-inch F/5.9 Limited Edition Dobsonian

Introducing the Scientific Esprit Observatory 8-inch Doberman Telescope (Model: ES-ON20859RR), a perfect blend of affordability and performance for astronomers and stargazers alike. This 8-inch Dobsonian telescope, with its f/5.9 primary mirror, offers an impressive light-gathering capability that reveals stunning views of the night sky.

The ES-ON20859RR telescope boasts an 8-inch (203mm) parabolic primary mirror, which is coated with enhanced multi-layer aluminum mirrors. These mirrors provide excellent reflectivity and transmission, producing crisp, clear, and bright images. The parabolic shape of the mirror ensures that the light rays converge at a single point, eliminating spherical aberrations and providing optimal image quality.

The telescope comes with a 1.25-inch dual-speed Crayford focuser, which offers fine focus adjustments and smooth operation. This focuser can accommodate 1.25-inch eyepieces, making it ideal for various observing applications, from lunar and planetary exploration to deep-sky observing.

The ES-ON20859RR Dobsonian telescope features a sturdy and portable Dobsonian mount. The altitude bearing is constructed from heavy-duty steel and is equipped with slow-motion controls for precise adjustments. The azimuth bearing has a large, adjustable handle for easy balancing and alignment, ensuring that the telescope remains steady during observations.

This telescope is designed for ease of use and portability. Weighing just under 30 lbs (13.6 kg), it can be easily transported and set up in various locations for optimal observing conditions. The telescope also includes a 25mm Plossl eyepiece, a 9mm Plossl eyepiece, and a 1.25-inch star diagonal for enhanced viewing comfort.

In summary, the Scientific Esprit Observatory 8-inch Doberman Telescope (ES-ON20859RR) is an excellent choice for those seeking an affordable yet high-performance telescope for stargazing. With its large primary mirror, smooth dual-speed focuser, and sturdy Dobsonian mount, this telescope offers impressive views of the night sky, making it an invaluable addition to any astronomer's arsenal.

The Scientific Astronomics ES-ON20859 Ritchey-Chretien 8-inch Dobsonian telescope is a popular choice among amateur astronomers due to its compact size and decent performance. Here are some pros and cons that can help you decide if this telescope is right for you:

1. Compact and portable: The ES-ON20859 is an 8-inch Dobsonian telescope, which is relatively small and easy to transport. It makes it an excellent option for observers who want to explore the night sky from different locations.

2. Decent light-gathering ability: The 8-inch primary mirror provides a good amount of light-gathering ability, allowing you to observe faint objects such as galaxies and nebulas.

3. Easy to set up: Dobsonian telescopes are known for their simplicity and ease of use. The ES-ON20859 comes fully assembled, and setting it up only requires aligning the finder scope and balancing the telescope.

4. Affordable: The ES-ON20859 is priced competitively compared to other telescopes with similar specifications, making it an excellent value for the money.

1. Limited resolution: The ES-ON20859 is a Ritchey-Chretien design, which uses a secondary mirror to correct the optical aberrations. While this design provides better image quality than a standard Dobsonian, it doesn't match the resolution of a high-end refractor or a Schmidt-Cassegrain telescope.

2. Not ideal for visual double stars: The ES-ON20859's secondary mirror can introduce some diffraction spikes, making it less suitable for observing visual double stars.

3. Limited payload capacity: The Dobsonian mount is not designed to carry heavy telescopes, and the ES-ON20859 is no exception. If you plan to add heavy accessories such as a camera or a motorized tracking system, you may need to consider upgrading to a heavier mount.

The Scientific Astronomics ES-ON20859 Ritchey-Chretien 8-inch Dobsonian telescope is an excellent choice for amateur astronomers who want a compact and portable telescope with decent performance. It provides a good balance between light-gathering ability and portability, making it an excellent value for the money. While it may not match the resolution of more expensive telescopes, it still offers impressive views of the night sky and is an excellent starting point for anyone interested in astronomy.

If you're looking for an 8-inch telescope that is portable, easy to use, and provides good value for the money, the Scientific Astronomics ES-ON20859 Ritchey-Chretien 8-inch Dobsonian telescope is an excellent choice. It's a versatile telescope that can be used for both visual and imaging applications, and its compact size makes it perfect for observers who want to explore the night sky from different locations. However, if you're looking for the highest possible resolution, you may want to consider a more expensive refractor or a Schmidt-Cassegrain telescope.

Details:

Aurora, IL 60502, USA. Smart Phone Adapter. Explore Scientific ES-ON20859RR: 8-Inch f/5.9 Limited Edition Dobsonian Reflector Telescope, Ruby Red. Explore Scientific 8-Inch f/5.9 Limited Edition Dobsonian Reflector Telescope, Ruby Red, ES-ON20859RR.

Features of Explore Scientific 8-Inch f/5.9 Limited Edition Dobsonian Reflector Telescope: Striking Design with Serious Optics - The ruby-red optical tube adds visual flair during the day, while 208mm primary mirror delivers powerful light-gathering for impressive views deep-sky objects, Moon, and planets at night.

part #: eson20859rr prices

• $449.99-$995.00

specifications telescuper:

• brand: Explore Scientific
• mpn: Es-on20859rr
• department: Men
• type: Telescopes

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• started: February 24, 2026
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• # reviews: 5423
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• city: Northbrook, Illinois

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