Full Frame On-Axis Guider ONAG® XM (unit only)


ONAG® XM for full frame chips, up to 50mm in diagonal (unit only)
Now with a most anticipated helical focuser for your guiding camera!


This is the ONAG XM unit only, please see our accessories for standard spacers and adapters.

For ONAG backfocus calculation and Excel spreadsheet click here.

The ONAG XM is the new full frame (up to 50mm diagonal) member of our On Axis Guider product line.
It replaces our popular ONAG XT now discontinued.

The ONAG XM offers the same great features than the ONAG XT.
It is fully compatible with the ONAG XT therefore you can use the same adapters and spacers than for the XT version.
When associated with FocusLock software it offers an unique solution for guiding and continuous real time auto-focus using our SharpLock patent pending technology. There is no need to interrupt your imaging session for any periodic re-focusing runs anymore.

It is equipped with a guider helical focuser for fine focus (800 microns for 360 degrees of focus ring rotation) associated with a new X/Y stage for the guider port (GP).
This stage has been engineered to support larger, and heavier, guiding cameras with large field of view (FOV) for remote operations. The ONAG XM guider focuser supports APS-C chips with diagonal up to 28mm, such as the popular KAF8300.
A large guider FOV provides access to many guide stars without using the integrated ONAG X/Y stage, it is also the only solution for multi-star guiding using the same scope than for imaging (MaxIm DL 6 supports multi-star guiding now, other are coming).
To know more about our  patented ONAG technology please visit our eduction page on this matter.

Innovations Foresight recognizes that ONAG’s users may want to customize their ONAG solution to fit their setups, as well as to use adapters/spacers they may already own.
We offer you the opportunity to buy your ONAG unit and select separately adapters/spacers, if any, you may need only.
We also offer kits for various configurations, such as full kits with all the Innovations Foresight adapters/spacers you may need with your ONAG for most standard setups. See our ONAG product page for such kits.

The ONAG XM is optimized for full frame, up to 50mm in diagonal, imaging chips.
The ONAG XM scope and imaging ports (SP, IP) use a 59mm dovetail system for rigid connections with the scope imaging train (focuser, rotator, focal reducer, …) and imaging/filter wheel equipments.
The ONAG XM guide port uses a T2 (M42 x 0.75mm) male thread for connection to a guider camera.

To fit your needs Preciseparts.com provides custom adapters for any of our ONAG.

For download of FocusLock (FL) continuous real time auto-focus capable software please click here.

For fast scopes with f/#<8 and/or large central obstructions (>35%) we recommend considering our astigmatism corrector. When used with the continuous real time auto focus software FocusLock (FL) the corrector can be rotated to dial back some controlled level of astigmatism.
Fell free to contact us for any advice and support.

Watch the ONAG technology video below:


  • Finding a guide star has never been easier!
  • For your best images yet, ONAG Features:
  • Wide FOV for your guider with the integrated X/Y stage.
  • No differential flexure even with long focal lengths.
  • NIR guiding for reduced seeing & a smooth tracking.
  • No rotation needed, enjoy reusing your flat frames.
  • No filter in the way, ideal for narrow band imaging.
  • Sharp images with SharpLock our real time autofocus.
  • No periodic refocus anymore, save time with SharpLock.
  • Light weight (0.8 Kg) and much more…

Typical specifications:

Product Specifications: without extension tube
Over all dimensions: 123 x 110 x 70 mm
ONAG® weight: 850 g
Imager back focus: 68 +/-2 mm
Guider back focus, half way extended: 101 +/-1 mm
Imager chip diagonal: Up to 50mm (full frame, 36x36mm, …)
X/Y stage, full X travel: 37 mm
X/Y stage, full Y travel (excepted low profile): 24 mm
X/Y stage, maximum off-axis offset: 22 mm
X/Y stage maximum exploration circle: 44 mm
Guider focuser type: Helical
Guider focuser travel: Minimum 9 mm
Scope port: Dovetail 59mm
Imager port: Dovetail 59mm
Guider port: T-thread (M42 x 0.75)
Dichroic beam splitter coating: Fully multi-coated
Dichroic beam splitter protection (both sides): Optical grade quartz
Typical dichroic beam splitter reflection (visible): > 98%
Dichroic beam splitter visible range: > 370 nm to 750 nm
Typical dichroic beam splitter transmission (NIR): > 90%
Dichroic beam splitter NIR range: > 750 nm to 1200 nm
Anodizing: Black, low reflection
Guider port corrective optics No
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