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Innovations Foresight ONAG® XM - On-Axis Guider

Innovations Foresight ONAG® XM - On-Axis Guider

Product Number: IF-ONAG-XM

Manufacturer: Innovations Foresight
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Price: $1,399.00
The new standard in guiding: Innovation Foresight's ON-Axis Guider, ONAG® XT (patent pending)
  • Finding a guide star has never been easier!
  • Presenting your scope's field of view to your guider.
  • No more differential flexure even with long focal.
  • Integrated X/Y stage for your guider.
  • Reduce seeing effect by guiding with near infrared (NIR).
  • Ideal for medium to long focal scopes, such as RCT and SCT.
  • ONAG® for chip diagonals up to 28mm, KAF8300, KAI10100..., and ONAG® XT for diagonals up to 50mm.
  • Accepts most focal reducers.
  • No extra load for your mount, weight only 0.8 kg (1.8 lbs).
  • No rotation necessary for finding a guide star.
  • Enjoy reusing your flat frames over and over again.
  • No filter in the way, ideal for narrow band imaging!
The ONAG® XT features:
  • Rigid 59mm dovetail system for scope and image ports
  • Tilt/tip user adjustable dichroic mirror (laser aligned at factory)
  • Guider port with corrective optics providing seeing limited guide stars
  • 68mm imager back focus (compare with 66mm for the ONAG®)
  • Compatible with AO units, including the AO-L from SBIG
  • X/Y stage with a T-thread M42 x 0.75mm connection as well as 1.25" nosepiece compatible

Guiding is a difficult proposition at best. Any deviation of less than a pixel during an exposure translates to errors as little as a 1/3 arc with a long focal, leads to elongated stars. Finding a guide bright star becomes a challenging and time consuming task. Basically there are several traditional options for guiding:
  • Guide-scope: The main advantage is a wide fov since most guide-scopes have short focal length. Therefore you are almost guaranteed to find a suitable guide star. However guide-scopes are prone to differential flexures. The mechanical connection between both scopes must be very rigid otherwise you will experience elongated stars, and it does not take much. Guide scopes may also add significant extra load to your mount.
  • Off-axis guider (OAG): The guider uses a pick-off prism placed in the vicinity of the imager, yet off-axis such it does not cast any shadow to your image. The resulting donut like fov is quite narrow. Since OAGs use the same scope there is neither differential flexure nor SCT mirror flop issues. However they have limited fov to find a suitable guide star, higher F-numbers associated with small prisms, as well as possible extreme off-axis optical distortions (coma).
  • Self-guided camera: Self-guided cameras use a second CCD sensor located near the main one, yet on the same focal plane such both sensors, the imager and the guider ones, reach focus in same time. This is like an OAG in a single body solution. Both self-guided camera and OAG may be extremely challenging to use with filters, especially narrow band ones, since those are placed before the guider sensor.
The ONAG splits the incoming light in two components with a dichroic beam splitter. The visible (370nm-750nm) is reflected toward the imager while the NIR (>750nm) goes straight to the guider. This design avoids any optical aberration for your images since it uses the reflected light, like a star diagonal does. Monochrome CCD/CMOS cameras are sensitive in NIR and more than 76% of the main sequence stars have surface temperatures lower than 3700K radiating large amount of infrared energy. The ONAG® combines the advantages of the OAG, no flexure, with the wide fov of a guide-scope. Since any filters will be placed in front of the imager, the guider is not affected by them, a great advantage for narrow band imaging! Its integrated X/Y stage provides an easy and fast way to find a guide star, resulting in a fov >1.3 arc-degree for a 2m focal.





Download the ONAG® and ONAG® XT User's Manual here.

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