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Explore Scientific

Explore Scientific FirstLight 90 mm f/5.5 Achromatic Refractor Telescope on Yoke-Style Alt-Az Mount (FL-AR90500AZ)

Explore Scientific FirstLight 90 mm f/5.5 Achromatic Refractor Telescope on Yoke-Style Alt-Az Mount (FL-AR90500AZ)

$89.99
$89.99
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Shipping calculated at checkout.

The Explore Scientific FirstLight 90 mm f/5.5 Achromatic Refractor Telescope (FL-AR90500AZ) is a user-friendly optical system that combines a bright 90 mm aperture with a well-balanced yoke-style altitude-azimuth mount. Designed for beginners and casual observers, this refractor delivers sharp views of the Moon, planets, star clusters, and brighter deep-sky objects. The fast f/5.5 focal ratio yields a generous field of view — ideal for wide-field observation and scenic star fields. The included accessories such as a star diagonal, Plössl eyepiece, and a red-dot finder make setup and target acquisition quick and intuitive, so you can spend more time observing and less time preparing.

Features

  • 90 mm aperture — gathers plenty of light for crisp, detailed views of celestial objects.

  • Fast f/5.5 focal ratio — wide field of view, great for star clusters, nebulae, and Milky Way observing.

  • Achromatic doublet optics — delivers balanced color and contrast for visual astronomy.

  • Yoke-style Alt-Azimuth mount — smooth, intuitive tracking in altitude and azimuth axes, ideal for beginners.

  • Stable mount with adjustable support — gives reliable alignment for visual observing sessions.

  • Included accessories — comprehensive starter kit (eyepiece, diagonal, finder) for immediate use.

Specifications

Specification Detail
Model Number FL-AR90500AZ
Optical Design Achromatic refractor
Aperture 90 mm
Focal Ratio f/5.5
Focal Length ~495 mm
Mount Type Yoke-style Alt-Azimuth
Eyepiece Included Standard Plössl eyepiece
Diagonal 90° star diagonal
Finder Red-dot finder
Use Case Beginner to casual observing — lunar, planetary, clusters, bright nebulae
Accessories Eyepiece, finder, diagonal (included)

What’s Included

  • 90 mm achromatic refractor optical tube

  • Yoke-style altitude-azimuth mount

  • 90° star diagonal

  • Plössl eyepiece

  • Red-dot finder

  • Mounting hardware and accessories

View full details

Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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All telescopes on Telescope Wolves are hand-picked with beginners in mind. If you're unsure which telescope is right for you, check out our Telescope Buying Guide.
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