Astrodon Monster MOAG Off-Axis Guider with Built-in Filter Drawer and one included Filter Slider

Astrodon SKU: MMOAG-FD
MMOAG-FD Product Shot 2000x2000 (6795898585241)

Astrodon Monster MOAG Off-Axis Guider with Built-in Filter Drawer and one included Filter Slider

Astrodon SKU: MMOAG-FD
Regular price $795.00 Sale price $636.00 Save $159
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New! Our Astrodon Monster MOAG has been updated to have a built-in filter drawer!

MOAG means Manual Off-Axis Guider. It 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. The Astrodon Filter Drawer is the perfect way to quickly swap filters in your astrophotography setup!

  • Back focus consumption 32mm

  • Pick-off prism size 12.4mm x 12.4mm

  • Travel of Helical Focuser: 10mm

  • Back Focus: 35.125mm


Additional drawer sliders are sold separately and are available here:

36mm: available here

45mm available here

50mm round: available here

50mm Square: available here


MOAG means Manual Off-Axis Guider. It 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.

The Filter Drawer allows you to swap out filters of your choice. The Filter Drawer comes with one filter slider of your choice: 31mm round, 36mm round, 50mm Round, or 50mm Square. Additional filter sliders are available.

Our 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 and slider becomes a fixed part of your optical train along with your camera. 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.

Unlike our traditional MMOAG, we have upgraded this product to allow easy swapping of filters!

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