ZWO OAG-L

Name: ZWO OAG-L
Brand: ZWO

ZWO

ZWO OAG-L guides through the main telescope's light path to reduce flexure on demanding imaging rigs.

off-axis-guider $$ Guiding Long focal length Off-axis guider

Best Current Offer

Agena AstroProducts

In stock

$179.00

Other retailers

Cloud Break Optics (In stock)
$179.00
High Point Scientific (In stock)
$179.00
Mile High Astronomy (In stock)
$179.00
Starizona (In stock)
$179.00
Telescopes.net (In stock)
$179.00
ZWO USA (In stock)
$179.00
Astronomics (In stock)
$179.10

Specifications

Overview

Guider type: Off-axis guider

Mechanical

Format: Large-format OAG

Use

Primary use: Guiding through the main imaging telescope to eliminate guide-scope flexure

Astrophotography Fit

Best for long focal length or mirror-based systems where a separate guide scope can drift relative to the imaging camera.

ZWO OAG-L uses a pick-off prism ahead of the camera so the guide camera sees the same tracking errors as the imaging sensor. That makes it the preferred guiding approach for SCTs, RCs, and long refractors.

Setup takes patience: prism height, guide-camera focus, back focus, and filter-wheel spacing all interact. Once dialed in, it is more dependable than a separate guide scope for demanding rigs.

Best paired with

SCT, EdgeHD, RC, or long refractor imaging trains
Sensitive guide cameras with enough sensor area for guide-star choice
Threaded camera/filter-wheel stacks with known back focus

Not recommended for

Very short wide-field rigs where a guide scope is simpler
Beginners who need the easiest possible guiding setup
Imaging trains with no back-focus room for an OAG body

Where To Buy

Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.

Retailer	Price	Availability	View Offer
Agena AstroProducts Agena AstroProducts	$179.00	In stock Updated 8/5/2026	View Offer - $179.00
Cloud Break Optics Cloud Break Optics	$179.00	In stock Updated 8/4/2026	View Offer - $179.00
High Point Scientific High Point Scientific	$179.00	In stock Updated 8/4/2026	View Offer - $179.00
Mile High Astronomy Mile High Astronomy	$179.00	In stock Updated 8/5/2026	View Offer - $179.00
Starizona Starizona	$179.00	In stock Updated 8/5/2026	View Offer - $179.00
Telescopes.net Telescopes.net	$179.00	In stock Updated 8/5/2026	View Offer - $179.00
ZWO USA ZWO USA	$179.00	In stock Updated 8/5/2026	View Offer - $179.00
Astronomics Astronomics	$179.10	In stock Updated 8/4/2026	View Offer - $179.10

Price History

Chronological retailer pricing with out-of-stock points shown at reduced opacity.

Agena AstroProducts Astronomics Cloud Break Optics High Point Scientific Mile High Astronomy Starizona Telescopes.net ZWO USA