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Explore Scientific  |  SKU: FL-AR90500AZ

Explore Scientific FirstLight 90mm f/5.5 Doublet Refractor Telescope with Alt-Az Mount


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Ships from US warehouse in 1-2 business days

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Explore Scientific FirstLight 90mm f/5.5 Doublet Refractor Telescope with Alt-Az Mount



  • Large 90mm aperture packs enough light-gathering power for revealing looks at galaxies, nebulae and clusters as well as lunar and planetary features.
  • Doublet design uses a pairing of glass lenses separated by a cushion of air to minimize chromatic aberrations.
  • Simple yoke mount with an altitude rod makes it easy to smoothly move the telescope and track objects.
  • Full-size tripod includes accessory tray to keep eyepieces handy and provide additional stability.
  • Model comes with 9mm and 20mm Kellner eyepieces and a red dot viewfinder to aid in object location.
  • Erect image diagonal provides proper image orientation for terrestrial use.
  • Included adapter helps observers use their smart device to capture and share images.


The Explore Scientific FirstLight 90mm f/5.5 Alt-Az Refractor Telescope is ideal for users who want a portable platform for lunar and planetary observations.

Its 90mm aperture can gather enough light to easily reveal lunar details and its shorter focal length produce a fast focal ratio for high quality resolution. Additionally, its sturdy rack-and-pinion focuser allows for DSLR imaging rigs.

This model comes with an easy to use "U" style yoke alt-az mount which is supports by an adjustable-height aluminum tripod that comes with a center tray to add stability and offer a convenient place to hold accessories.

As an added benefit, this package includes an adapter that allows you to use your smartphone to easily capture and share the beauty unfolding in your eyepiece. With Firstlight, the only thing you need to provide is a desire to discover.

FirstLight AR90mm White Tube Refractor telescope with 500mm focal length f/5.5 multi-coated telescope with Alt/AZ “U” Yoke mount; Aluminum tripod; 1.25" draw tube focuser; 1.25" Erect Imaging Diagonal; 1.25" K9 and K20 eyepieces; and HD119 Red-dot Finder; and Smartphone Camera adapter.

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Explore Scientific FirstLight 90mm Doublet Refractor Telescope with AZ Mount - FL-AR90500AZ 8122570183906

Explore Scientific FirstLight 90mm f/5.5 Doublet Refractor Telescope with Alt-Az Mount





90 mm | 3.5"

Focal Length

500 mm

Focal Ratio


Field of View




Barrel Size





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