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Explore FirstLight 127/1900mm Maksutov-Cassegrain OTA:


Explore Scientific's compact FirstLight 127mm f/15 Maksutov-Cassegrain Telescope is ideal for users who want a portable yet powerful optical tube assembly (OTA) that is able to achieve high magnifications for detailed views of the moon and planets and has the ability to reach out past our solar system to split tricky binary stars and view brighter deep-sky objects.

The Maksutov design exchanges the conventional front corrector plate of a Schmidt with a convex meniscus lens, resulting in a smaller secondary mirror that limits obstruction and increases contrast, while eliminating the need for periodic collimation. This modified optical path results in a slower focal ratio and narrower field of view versus a similar Schmidt, but the optical benefits, when coupled with the larger aperture and fully multi-coated optics, make this an ideal scope for making detailed solar, lunar, and planetary observations, while being able to resolve deep-sky objects like stars, clusters, galaxies, and nebulae.


iEXOS-100-2 PMC-8 Equatorial Tracker System:


The iEXOS-100-2 PMC-Eight™ Equatorial Tracker System is a complete astronomical computerized Wifi or Wired GOTO Equatorial Tracker with integrated PMC-Eight™ electronics suitable for attaching Small Telescopes or DSLR Cameras attached to the Explore Scientific DSLR Camera Dovetail Assembly.


Use with the free ExploreStars App for Tablets (Windows, Android, Amazon and Apple), or with the free ASCOM Standards Compliant PMC-Eight™ ASCOM driver and the ASCOM POTH Client from Explore Scientific (either wired or wireless) to work with virtually any sky software that supports ASCOM. Tablet or computer must be purchased separately.


The iEXOS-100-2 utilizes a proven German equatorial mount design and Explore Scientific’s revolutionary PMC-Eight™ Precision Motion Control system to flawlessly navigate the night sky and track objects as they journey across it. This combination provides superior observing and imaging performance without a prohibitive price tag.


GOTO systems play an important role in the world of amateur astronomy because they ensure users spend less time searching for particular objects and more time observing and imaging. The PMC-Eight™ with its versatile connections supported with free to download apps for Windows computers or Android and iOS tablets only (tablets must have a screen of at least 7 inches), or through the free to download ASCOM PMC-Eight™ driver and POTH Client to connect to your favorite ASCOM Compliant Astronomical Software, can allow you to control the telescope from a few feet away or by communicating computer-to-computer with an Internet connection from virtually anywhere in the world. 


One of the standout features of the iEXOS-100-2 system is its German equatorial design. When it comes to tracking the stars with a telescope, there is nothing that compares to a German Equatorial Mount (GEM) because it will precisely follow objects as they rise in the east and set in the west. For observers, a GEM makes it easy to keep your celestial target in your eyepiece. For imagers, it helps you avoid common astrophotography pitfalls like field rotation.

Before you can track an object, you need to find it, and that objective can be daunting when you’re faced with a vast expanse of inky black sky or a bright city sky. The iEXOS-100 puts a powerful GOTO system in your arsenal of astronomical tools that takes the frustration out of navigating the night sky. This integrated version of Explore Scientific’s PMC-Eight™ system transcends the industry standard single processor by utilizing an 8-core microcontroller with eight CPUs that operate independently of one another to focus on defined functions. This delegation of tasks among the processors results in a system that offers superior responsiveness, efficiency, reliability and astoundingly fast timing intervals for smooth image acquisition and accurate tracking.


Explore FirstLight 127/1900mm MAK OTA with iEXOS-100-2 PMC-8 EQ GoTo Mount

Sales Tax Included
  • OTA:

    Optical Design Maksutov Cassegrain
    Aperture 127 mm / 5"
    Focal Length 1900 mm
    Focal Ratio f/15
    Focuser Internal
    Eyepiece Barrel Diameter 1.25"
    Diagonal 90° Star



    Mount head weight 9.45 lbs
    Tripod weight 5.35 lbs

    Tripod fully collapsed,

    no mount head:


    Tripod open, retracted legs,

    no mount head:


    Tripod open, retracted legs

    with the mount head:

    38.5” at highest point,

    36” to the center of

    the mounting bracket

    Tripod open, legs fully

    extended, no mount head:


    Tripod open, legs fully

    extended with the mount


    45” at highest point
    Counterweights (2) 1 kg each
    Mount weight capacity

    Approx. 9 lbs


    weight only),

    15 lbs Photographic

    (equipment and


    Approx. 19 lbs Visual

    (equipment and


    Connection Wire, WiFi, or Bluetooth®
    • 127mm Catadioptric OTA
    • 1900mm Focal Length, f/15 Focal Ratio
    • Fully Multi-Coated Optics
    • Internal Focusing Mechanism
    • 1.25" 25mm Eyepiece and 90° Diagonal
    • Red-Dot Finderscope
    • Smartphone Eyepiece Adapter
    • 1.25" Stainless Steel Tripod with Tray
    • iEXOS-100-2 PMC-Eight™ Equatorial Tracker System
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