Astrodon MonsterMOAG Off-Axis Guider one guider port

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.

Our MonsterMOAG (MMOAG) is specifically designed to accommodate the larger CCD imaging detectors (36 x 36 mm), such as the Kodak KAF16803E and KAF9000E. Furthermore, at 1.25" 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.

Specification:

For largest CCDs (KAF16803, KAF9000)Small backfocus 1.25" 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 filtersMore and brighter guide stars with unfiltered lightGuide in the main optical beam
Avoid differential flexure of guide scopeFixed guider position for automated data acquisitionHelical 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) includedFemale 2.7"-24 / Male 3"-24 camera-side adapter (0.1" thick) includedAdapters have dovetail connections to prevent tiltAdapters can be rotated and locked to align with telescope and cameraWide variety of adapters and different backfocusAdditional guide port assemblies come with prism, prism spacers, oval holder, helical focuser and 1.25" manual holder