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Explore Scientific FirstLight 90mm Doublet Refractor Telescope with AZ Mount

SKU FL-AR90500AZ

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$129.99

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CA Residents: Prop 65 Warning(s)

Whether you’re looking to delve into the details of our solar system or explore inspiring deep sky treasures, the versatile FirstLight telescope series has an observing package that will fit your individual needs. Each of the combinations in this new line comes complete with all of the essentials: a telescope, a sturdy mount, an eyepiece and a red dot viewfinder. Telescope offerings include achromatic refractors ranging in aperture from 70mm to 152mm, Maksutov-Cassegrains from 100mm to 152mm, and Newtonian reflectors from 114mm to an impressive 203mm.

Mounts vary from a simple fork-mounted alt-azimuth option to a complete GOTO tracking system. As an added benefit, each 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.

Recommended Accessories: Astrozap 4” Dew Heater Strap

CA Residents: Prop 65 WARNING(S)

  • 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.
Item Number FL-AR90500AZ
Comes With Smartphone Adapter, Red Dot Viewfinder, Downloadable Software
Lens Coatings Fully Multi-Coated
Magnification 125x
Focal Length 500mm
Focal Ratio f/5.5
Adapter 1.25" draw tube focuser; 1.25" Erect Imaging Diagonal
Optical Diameter 90mm
Eyepiece 1.25" K9 and K20 eyepieces
Mount Type Alt/AZ “U” Yoke mount; Aluminum tripod


Limited Warranty is one year, which converts to the Explore STAR Transferable Extended Life of the Product Warranty when product is registered within 60 days of purchase. Click Here to register.


Customer Reviews

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William Padgett
A snappy little workhorse for general viewing

I was keeping an eye out for a better 80mm f/5 than the one I owned, when this 90 F/5.6 popped up on sale for a price I couldn't refuse. I knew I would sacrifice a little field of view, but could expect a little more brightness and resolution over the 80. I was not mistaken. This scope annihilated my dim 80 and unexpectedly, with the use of a decent barlow, also replaced my 90 F/11 (a scope I enjoyed, but was obviously not designed to go wide). With a low powered plossl this scope yields pleasing views of stellar vistas. Mid-powered eyepieces nicely frame star clusters; I experienced a particularly memorable view of the perseus double cluster through an ES 14mm/82° placed in this scope. For lunar and planetary observing and splitting doubles, I use a quality 3x barlow. I will generally use an 18mm with the barlow for lunar and planets, and an 11mm for tighter binary splits- I just recently got a clean, tight split of the double-double with this setup. There are plenty of lunar features within the grasp of this little scope, including rilles that I'm constantly combing the surface for. Jupiter readily displays its more prominent bands and Galilean moons; larger transit shadows are also visible as tiny specks on it's surface. Saturn displays its disk shape and mass of rings cleanly. In general, stars appear as beautiful pinpricks. Even though my neighbor insists on keeping his Christmas lights on year-round, I can still observe the Bodes and cigar galaxies. The ring nebula and other brighter deep-sky targets are no problem. I'm assigning this scope 5 stars strictly for the optics in proportion to its price. I've never used the included diagonal; I swapped it immediately for one of the nice dielectrics I had laying around. I've never used the included eyepieces. I mounted the scope on a fluid pan head photo tripod within a week of receiving it. The included mount and tripod was usable but I much prefer using my photo tripod. The included finder does its job so I never swapped it. The focuser that came with mine, while plastic, has no slop and the knobs are large enough to finesse. This is marketed as a beginner scope. For me, this is a ready-to-go scope to keep by the door. I've got the beastly 10 inch dobsonian. I've got a weighty 4 inch ED frac on a hefty motorized mount. Those scopes have their place and get their use, but most sessions these days involve me taking my super-light short 90 on my simple photo tripod right outside my door for immediate, general purpose use. I don't think this scope is for pushing to the limit. It will call in sick on star test day. It does provide beautiful, clean views of all the many sights I use it for.

Whether you’re looking to delve into the details of our solar system or explore inspiring deep sky treasures, the versatile FirstLight telescope series has an observing package that will fit your individual needs. Each of the combinations in this new line comes complete with all of the essentials: a telescope, a sturdy mount, an eyepiece and a red dot viewfinder. Telescope offerings include achromatic refractors ranging in aperture from 70mm to 152mm, Maksutov-Cassegrains from 100mm to 152mm, and Newtonian reflectors from 114mm to an impressive 203mm.

Mounts vary from a simple fork-mounted alt-azimuth option to a complete GOTO tracking system. As an added benefit, each 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.

Recommended Accessories: Astrozap 4” Dew Heater Strap

CA Residents: Prop 65 WARNING(S)

  • 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.
Item Number FL-AR90500AZ
Comes With Smartphone Adapter, Red Dot Viewfinder, Downloadable Software
Lens Coatings Fully Multi-Coated
Magnification 125x
Focal Length 500mm
Focal Ratio f/5.5
Adapter 1.25" draw tube focuser; 1.25" Erect Imaging Diagonal
Optical Diameter 90mm
Eyepiece 1.25" K9 and K20 eyepieces
Mount Type Alt/AZ “U” Yoke mount; Aluminum tripod


Limited Warranty is one year, which converts to the Explore STAR Transferable Extended Life of the Product Warranty when product is registered within 60 days of purchase. Click Here to register.