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Summary of Contents for Optical Structures Astrodon MonsterMOAG MMOAG-1
- Page 1 MonsterMOAG™ Off-Axis Guider for 2 inch focuers Part #: MMOAG-1, MMOAG-2, MMOAG-3 & MMOAG-4...
- Page 2 Introduction The MonsterMOAG™ (MMOAG) is the our most © popular off-axis guider (OAG) from Astrodon designed for CCD imaging. It is designed to have a large (2.55”; 65 mm) opening with its 2.7” threaded fittings. It is suitable for the largest imaging detectors (KAF16803, KAF09000) with dimensions of 36x36mm and a 52 mm diagonal.
- Page 3 Features Solid aluminum body for no flexure, 3.1 x 3.1 x 1.23” Supplied with male and female adaptors (1 each) o 2.7”-24TPI threads (TPI, threads per inch) o Dovetail connection to MMOAG Allows for rotation and lock down on both sides ...
- Page 4 Slots for rotation on the focuser holder for fine alignment of the prism parallel to the optical axis Dimensions...
- Page 5 Installation Issues The flat side of the prism and the male 2.7” AP adaptor face the telescope. We suggest that you remove the male fitting by loosening the 8- 32 set screws in the MMOAG raised flanges with a 5/64 ball driver or with the provided hex wrench set.
- Page 6 The MMOAG female adaptor also has 3.000”-24 male threads on the outside that are 1/8” long. These fit into the new, large CFWs from Apogee Instruments (www.ccd.com ), SBIG (www.sbig.com), and Finger Lakes Instruments (www.fli-camera.com). However, the “overhang” of the holder for the helical focuser on top of the MMOAG may interfere with the CFW.
- Page 7 prism holder (3/32” ball driver/wrench), being careful not to let the prism fall and chip and edge. Add the additional spacer and reconnect the prism holder and prism. Re-insert the assembly into the top of the MMOAG and secure with the two 4-40 cap screws.
- Page 8 Laser spot is seen on a target about 6” away. Note the target is held fixed along the side of the table with the same plate. Laser spot is seen on target about 2’ away, again aligned with the table using the metal plate.
- Page 9 prism and the focal plane of the imaging camera (B). If too close, the focal point will be inside the helical focuser on the MMOAG. If too far, the focal point may be too far above the focuser, and require an eyepiece extender or just be too far away to be stable.
- Page 10 would be useful to plan for the mid-range of travel, or 3.4” + ½(1/2) = 3.6” as the target for A. There are several ways to increase B and/or decrease A to arrive at focus. 1. Use a 2.7” male fitting on your CFW. Add the appropriate AP extension tube to achieve >3.65”...
- Page 11 1. Remove the 1.25” nosepiece from the camera. 2. Make sure the two thumbscrews at the top of the focuser are retracted and do not interfere with light coming to the guide camera. If you remove these thumbscrews, make sure you tape over the holes (e.g. black electrical tape) to prevent stray light from getting into the guide camera.
- Page 12 1. Orient your camera along N,S,E,W. 2. Slew to a bright star, such as Deneb, and center it. 3. Do an image link with TheSky to determine your orientation. 4. Note the position of the internal guide detector. 5. The location of the guide camera in the MMOAG is on the opposite side of the imaging detector in the field-of- view (FOV) indicator in TheSky.
- Page 13 13. Add another element to TheSky that represents the size of the guide detector at the proper position on that circle. Please note that this will likely be rotated 90 degrees with the long direction point away from the center of the FOV due to the prism reflection. Here is an example with the guide star centered in the rectangle representing the guide camera (upper left) The procedure is the same for other brands of cameras lacking...
- Page 14 other fittings needed for other configurations. In this case we recommend that you contact PreciseParts, at www.preciseparts.com who specialize in making one-of-a-kind threaded adaptors for astronomy. They know the specifications of the MMOAG dovetail adaptors and how the part fits into other systems.
- Page 16 Lumicon is owned by Optical Structures Incorporated. 11371 Pyrites Way, Suite Rancho Cordova, CA 95670 916-638-2003 www.FarpointAstro.com...