Explore Scientific FirstLight 90mm f/5.6 Achro Refractor Alt-Az Telescope

Explore Scientific FirstLight 90mm f/5.6 Achro Refractor Alt-Az Telescope

Explore Scientific FirstLight 90mm f/5.6 Achro Refractor Alt-Az Telescope

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Expected availability: 7-14 business days

Product Highlights

  • 90mm Achromatic Refractor
  • 500mm Focal Length, f/5.6 Focal Ratio
  • Fully Multi-Coated Optics
  • 1.25" Rack-and-Pinion Focuser
  • 9mm and 25mm Eyepieces
  • 90° Erect-Image Diagonal
  • Universal Smartphone Adapter
  • Manual Alt-Az Yoke Mount
  • Adjustable Aluminum Tripod with Tray
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  • 1Description

The Explore Scientific FirstLight 90mm f/5.6 Achro Refractor Alt-Az Telescope combines portability and simplicity to provide new users with a complete observational platform for viewing the moon and planets. Outfitted with a 3.5" aperture, it can gather enough light to easily reveal lunar details, pick out Martian icecaps, and resolve Saturnian rings. Its sturdy rack-and-pinion focuser allows it to handle heavier or awkward loads such as DSLR imaging rigs, or the included smartphone adapter, and the 1.25" drawtube accepts the most common and popular sized eyepieces and accessories to allow easy add-ons as the user progresses in the hobby.

The OTA is carried by an easy-to-use "U"-style yoke alt-azimuth mount, and supporting the mount head and OTA is an adjustable-height aluminum tripod that comes with a center tray to add stability and offer a convenient place to hold accessories such as eyepieces, filters, and adapters. To ensure users can start viewing right out of the box, Explore Scientific includes two eyepieces that produce high and moderate magnifications, a 90° erect-image diagonal so the scope can also be used as a conventional terrestrial spotting scope, and a red dot finder.

Optical Tube Assembly
  • 90mm aperture
  • f/5.6 focal ratio
  • 500mm focal length
  • Refractor-style optical design
  • Achromatic lens configuration corrects for spherical and chromatic aberrations to reduce distortion, especially at the edges, and transmit accurate color rendition without halos or off-axis fringing
  • Anti-reflection fully multi-coated optics improve light transmission through the optical path for improved color, clarity, and contrast
  • Resolution (Dawes): 1.29 arcsec
  • 1.25" drawtube accepts the most common size of eyepieces and accessories
  • Sturdy rack-and-pinion focuser
Mount and Tripod
  • Manual alt-azimuth
  • "U"-style yoke design adds stability
  • Aluminum alloy legs
  • Adjustable height to accommodate a variety of users and observation positions
  • Center tray adds stability and offers a place for accessories such as eyepieces and filters
Included Accessories
  • 1.25" diameter barrel
  • 20mm focal length yields 25x magnification
  • 9mm focal length produces 56x power
  • 1.25" snout and eyepiece holder
  • 90° angle puts head at a comfortable viewing angle, especially when OTA is pointed at or near the zenith
  • Integrated erect-image prism corrects image horizontally and vertically to the telescope to be used as a conventional spotting scope
  • Red dot design
  • Unlimited field of view makes alignment and star-hopping celestial navigation fast and easy
  • Projects a red center aiming reticle that won't obscure small objects
    Smartphone Adapter:
  • 1.25" diameter barrel
  • Capture photos or video through telescope to text, email, share, and post immediately
In the Box
Explore Scientific FirstLight 90mm f/5.6 Achro Refractor Alt-Az Telescope
  • Yoke Alt-Azimuth Mount Head
  • Aluminum Tripod with Tray
  • 1.25" 90° Diagonal
  • 1.25" 20mm Eyepiece
  • 1.25" 9mm Eyepiece
  • Smartphone Adapter
  • Red Dot Finder
  • Limited 1-Year USA Warranty, Extendable to Transferrable Lifetime Warranty with Registration
  • Table of Contents
    • 1Description
    Optical Design Refractor
    Aperture 90mm
    Focal Length 500mm
    Focal Ratio f/5.56
    Eyepiece Barrel Diameter 1.25"
    Diagonal 90° erect-image
    1.25" snout and eyepiece holder
    Finderscope Red dot
    Tripod Aluminum
    Adjustable height
    Mount Type Manual alt-azimuth yoke-style
    Power Source None
    Optical Tube Dimensions Not specified by manufacturer
    Weight Not specified by manufacturer
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