On-Axis Guider ONAG® SC (unit only)


ONAG® SC for APS-C chips, up to 28mm in diagonal (unit only)
Now with a most anticipated helical focuser for your guiding camera!


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

For ONAG backfocus calculation and Excel spreadsheet click here.

The ONAG SC is a new member of our On Axis Guider product line, it replaced the standard ONAG now discontinued.
To know more about our patented ONAG technology please visit our eduction page on this matter.
The ONAG SC when associated with FocusLock software 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.

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 SC is optimized for APS-C, up to 28mm in diagonal, imaging chips.
All the ONAG SC optical ports, scope (SP), imaging (IP), and guider (GP), use a standard T2 M42 x 0.75mm (T thread) connections.

(Warning: The maximum thread penetration length at the ONAG SC SP is 5mm, longer threads may scratch the dichroic mirror coating)

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

For download of FocusLock real time auto-focus capable software please click here.

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.
  • Helical focuser for the guider.
  • Light weight (0.8 Kg) and much more…

Typical specifications:

Product Specifications: without extension tube
Over all dimensions: 123 x 92 x 83 mm
ONAG® weight: 770 g
Imager back focus: 66 mm +/- 2 mm
Guider back focus, half way extended: 90 mm +/- 1 mm
Imager chip diagonal: Up to 28mm (APS-C, KAF8300, DSLR, ..)
X/Y stage, full X travel: 37 mm
X/Y stage, full Y travel (excepted low profile): 28 mm
X/Y stage, maximum off-axis offset: 23 mm
X/Y stage maximum exploration circle: 46 mm
Guider focuser type: Helical
Guider focuser travel: Minimum 9 mm
Scope port: T-thread (M42 x 0.75)
Imager port: T-thread (M42 x 0.75)
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
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