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MOAG - Astrodon MonsterMOAG 3" Standalone Off-axis Guider - 1 Guide Port

Astrodon MonsterMOAG 3" standalone off-axis guider - 1 guide port

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    Astrodon Off-Axis Guider MonsterMOAG (Manual Off-Axis Guider) allows you to guide your telescope to obtain sharp, round stars by guiding in front of your filters using unfiltered light in the same optical beam as your imaging camera. This is particularly important for practical use of narrowband filters. It also eliminates potential differential flexure if you guide with a separate guide scope. With modern, automated data acquisition programs, framing your imaging target and placing a guide star in the guide camera is simple and no longer an issue, particularly if you have a remotely-controlled camera rotator.

    MonsterMOAG™ (MMOAG) is specifically designed to accommodate the larger CCD imaging detectors (36 x 36 mm), such as the KAF16803E and KAF9000E. Furthermore, at 1.23" thick, it has one of the thinnest backfocus for an OAG available, making MonsterMOAG™ an ideal choice for systems with minimal backfocus, such as the Takahashi FSQ106N refractor. However, it is strong enough to handle heavy loads from larger cameras and filter wheels.

    When installed, the MonsterMOAG becomes a fixed part of your optical train along with your camera and filter wheel. When you rotate your camera at the back of your telescope, these three components will rotate together. This means that the guide camera location will be fixed relative to the imaging camera. You define this once as your Field-Of-View-Indicator (FOVI) in programs like Software Bisque’s TheSkyX. Then you can frame your target while ensuring that the guide camera has a star to guide on.

    The new MMOAG-1,2,3,4 introduces the capability of attaching up to 4 guide ports to the MonsterMOAG. This was accomplished by making the body square and adding a hole on each side for insertion of the pick-off prism from the guide port assembly. Thus, one possibility could include one guide camera and one 1.25" eyepiece, for example. Any unused guide port will be shipped with a removable black metal plate. Extra guide port assemblies can be ordered at a later date. The thickness (backfocus) and adapters are the same as before. 


    For largest CCDs (KAF16803, KAF9000)
    Small backfocus 1.23" of the body
    Total backfocus with both provided adapters is 1.45"
    Solid body to hold large camera, filter wheel, filters
    Large central opening of 2.55"
    Guide in front of your filters
    More and brighter guide stars with unfiltered light
    Guide in the main optical beam
    Avoid differential flexure of guide scope
    Fixed guider position for automated data acquisition
    Helical focuser for precision focusing of guide camera
    Shorter 1.25" manual holder for guide camera also provided if the helical focuser is too tall to reach focus
    Male 2.7"-24 scope-side adapter (0.1" thick) included
    Female 2.7"-24 / Male 3"-24 camera-side adapter (0.1" thick) included
    Adapters have dovetail connections to prevent tilt
    Adapters can be rotated and locked to align with telescope and camera
    Wide variety of adapters and different backfocus
    Additional guide port assemblies come with prism, prism spacers, oval holder, helical focuser and 1.25" manual holder
    Please click on our Optical Configuration and Scope-Side Connections links to help configure your MMOAG with the correct adapters for your system.

    MegaMOAG 3" to 4" Off-Axis Guider
    Astrodon Off-Axis Guider

    The MegaMOAG takes the design of the MonsterMOAG and adapts it for telescope systems with larger optical openings. It comes with the same camera-side

    adapter as the MonsterMOAG but it has a 4" opening on the scope side and comes with a 4 1/16" – 24 male adapter to connect to larger extension tubes found on the back of many larger telescopes. The body is larger and the pick-off prism is further from center. It has the same 1.25" body thickness as the MonsterMOAG. It comes with either a single guide port (MeMOAG-1) or two ports (MegaMOAG-2), as shown in the picture. As with the MonstermOAG, a black metal plate will cover the unused port for a MeMOAG-1. A second port assembly can be added at a later time with the MonsterMOAG Extra Port Assembly (MMOAG-PORT).

    We work very hard to ensure that we offer the absolute best prices online.  If you find another online store that offers a lower price then us within six months of your purchase date please let us know and we will refund your original payment for the difference.  We want you to feel confident that you are getting the absolute best price for the product you are ordering.  If you find that our own website has a lower price for the same item you have ordered within six months of your purchase date will refund the difference as well.

    To request your partial refund simply e-mail us a link to the same product on our website, or on our competitors website within six months from the date of your order and we will process the credit accordingly.

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    • You must purchase the item from our website before requesting your Price Match Guarantee
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