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Astrodon - MOAG stand-alone version

Model#: MOAG-S

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Manufactured by: Astrodon

Astrodon - MOAG stand-alone version

Details

MOAG means Manual Off-Axis Guider, a non-moving part of your optical train.

 

This smaller member of our off-axis guider product line is specifically designed to be integrated with SBIG adaptive optics (AO) devices, including the ST/AO8 and STL/AO-L systems. AO technology allows fast guiding that can dramatically lead to sharper stars and finer detail. The MOAG can also be used as a stand-alone guider for any camera. For stand-alone applications involving KAI11000XM and larger detectors, we recommended the MonsterMOAG or MegaMOAG. GOALS * Take full advantage of AO technology * Faster AO guiding for better resolution * Guide in front of your filters * More guide stars with unfiltered light * Guide in the main optical beam * Avoid differential flexture and cost of guide scope * Fixed guider position for automated data acquisition FEATURES AND MODELS * MOAG-ST for SBIG ST/AO8 with T-thread adaptor * MOAG-A for SBIG STL/AOL with 2" STL adaptor * MOAG-S stand-alone with AP 2.7"-24 M/F adaptors * Dovetail adaptors to rotate and align MOAG * 2 3/8" backfocus for ST/AO8 or STL/AO-L * Helical focuser for easy focusing of guide camera * Removeable (barlow) lens to extend focus * Solid construction- no flexture * Optional eyepiece extension * Optional short 1.25" nosepiece holder

MOAG-A with STL and AO-L

MOAG-ST with ST and AO8

 

 GOALS 

  • Take full advantage of AO technology
  • Faster AO guiding for better resolution
  • Guide in front of your filters
  • More guide stars with unfiltered light
  • Guide in the main optical beam
  • Avoid differential flexture and cost of guide scope
  • Fixed guider position for automated data acquisition

FEATURES AND MODELS

  • MOAG-ST for SBIG ST/AO8 with T-thread adaptor
  • MOAG-A for SBIG STL/AOL with 2" STL adaptor
  • Dovetail adaptors to rotate and align MOAG
  • 2.5" backfocus for ST/AO8 or STL/AO-L
  • Helical focuser for easy focusing of guide camera 
  • Removeable (barlow) lens to extend focus
  • Solid construction - no flexture
  • Optional eyepiece extension
  • Optional short 1.25" nosepiece holder

 

 "Something like 25% of our 40 client scopes are now equipped with an Astrodon MOAG and SBIG AO system, and more will follow as Imagers discover what a MOAG can do."          Mike Rice, New Mexico Skies
 
 

MOAG-A with STL/AO-L on 24" RCOS RC       

Better View of 24" RCOS
RC on Fork Mount

 

 

 

 

 

 

 

SBIG brought adaptive optics (AO) technology to amateur astrophotography to assist guiding, by "wiggling" an optic several times a second, and only "bumping" themount when there is a significant deviation.  It is in essence a "fast" guider. 

Adaptive optics can reduce the size of stars, measured as FWHM (full-width at half-maximum intensity), by  0.5 arcseconds or more, depending upon the seeing conditions. This becomes significant at longer focal lengths for high resolution astrophotography. 

SBIG AO technology was designed for use with their internal guide CCD contained inside the imaging camera.  A major disadvantage is AO guiding through  filters.  Finding a bright guide star without AO optics with the internal guide CCD is often times a challenge. Finding one behind H-a, OIII or SII narrowband filters is even more  problemmatic.   AO guiding makes that even more challenging or impractical with AO frequencies of 5-20 Hz smearing out the star flux.

The MOAG-A now provides you with the opportunity to guide in front of your filters, potentially increasing signals over RGB filters by a factor of 3 and over an H-a filter by a factor of >100. 

The left figure below shows the MOAG-A placed between the SBIG STL and AOL.  Light comes from the telescope from the left, passes through the transparent AOL moving optic, through the MOAG-A and into the STL camera. Some of that  light is diverted with a pick-off optic and sent up to the STL-Remote guide head in the MOAG-A.  in this way, the benefits of AO technology can be used with unfiltered light.  Brighter guide stars allow higher frequencies to be used for AO guiding.

The AOL screws into the MOAG-A as it would into the STL.  The MOAG-A includes an adaptor with  2" male threads that screw into the STL nose plate.  This adaptor has a dovetail groove that fits into the MOAG-A body, and is tightened down against a flat flange with 4 set screws.  In this way, the AOL/MOAG can be rotated to the vertical position (relative to the imaging CCD) and locked into place, as shown below .  

A variety of adaptors can then be used to connect the assembly to the telescope.  As shown below, an STL-to-APmale adaptor screws into the AO-L and into a 2.7" AP extension tube at the back of a 12.5" RCOS RC telescope using 2.7" AP tubes

The MOAG takes up 2" of backfocus and the STL adaptor takes up another 3/8".

 


 


 

 

 

 

 

 

This image shows active AOL tracking of a very bright guide star, Scheat, in Pegasus with the MOAG-A on the 12.5" RC shown above.  MaximDL v 4.55 was used. A track time of 0.1s was used, resulting in a guide rate of 6.9 Hz..

Click on image to enlarge.

 

 

 

 

 

A 1 minute image taken with a green Astrodon filter using this AOL guiding configuration resulted in a FWHM of ~1.8 arcseconds that night. Without the AO, the seeing was >2.3 arcseconds.

The MOAG in many cases makes narrowband  AO imaging possible.  The image of M33 below show a 10 min (uncalibrated) exposure using the STL11000M and a 6 nm Astrodon H-a filter guided with the MOAG-A and AOL on a magnitude 8.1 guide star.  The guide exposure was 0.2s and the guide rate was 4.3 Hz (click on image to enlarge).

 

Once the location of the guide star is mapped, data acquisition programs can potentially find guide stars automatically.  The following screen capture from Software Bisque's TheSky v6 shows the location of the guide star used for the above H-a image of M33 with the MOAG-A.  It is near the center at the bottom with the red circular target.

 
 
 

Product Series

MOAG means Manual Off-Axis Guider, a non-moving part of your optical train.

 

This smaller member of our off-axis guider product line is specifically designed to be integrated with SBIG adaptive optics (AO) devices, including the ST/AO8 and STL/AO-L systems. AO technology allows fast guiding that can dramatically lead to sharper stars and finer detail. The MOAG can also be used as a stand-alone guider for any camera. For stand-alone applications involving KAI11000XM and larger detectors, we recommended the MonsterMOAG or MegaMOAG.

GOALS

  • Take full advantage of AO technology
  • Faster AO guiding for better resolution
  • Guide in front of your filters
  • More guide stars with unfiltered light
  • Guide in the main optical beam
  • Avoid differential flexture and cost of guide scope
  • Fixed guider position for automated data acquisition

 

FEATURES AND MODELS

  • MOAG-ST for SBIG ST/AO8 with T-thread adaptor
  • MOAG-A for SBIG STL/AOL with 2" STL adaptor
  • MOAG-S stand-alone with AP 2.7"-24 M/F adaptors
  • Dovetail adaptors to rotate and align MOAG
  • 2 3/8" backfocus for ST/AO8 or STL/AO-L
  • Helical focuser for easy focusing of guide camera
  • Removeable (barlow) lens to extend focus
  • Solid construction - no flexture
  • Optional eyepiece extension
  • Optional short 1.25" nosepiece holder

 

 

 

 

Additional Information

Name Astrodon - MOAG stand-alone version
Manufacturer Astrodon
Model MOAG-S