ZWO Off-Axis Guider For Astrophotography

ZWO Off-Axis Guider – Precision Guiding Without the Extra Load

The ZWO Off-Axis Guider (OAG) is an essential addition to any astrophotography setup, designed to provide highly accurate guiding while eliminating the need for an external guide scope. By utilizing the same optical path as your imaging camera, this OAG ensures that tracking errors, flexure, and differential movement are minimized—delivering pinpoint stars across long exposure images.

Compact and Lightweight Design

Unlike traditional guide scopes that add weight and require a separate mounting system, the ZWO Off-Axis Guider seamlessly integrates into your imaging train with minimal bulk. It’s a perfect solution for astrophotographers looking to improve guiding precision without overloading their mount. The all-metal construction ensures durability while keeping weight to a minimum.

High-Quality Prism for Maximum Light Capture

The OAG features a prism size of 8mm x 8mm, large enough to capture sufficient light for reliable guiding but small enough to avoid obstructing your primary imaging sensor. This makes it an excellent choice for both planetary and deep-sky astrophotography. The high-transmission optics ensure that even faint guide stars remain visible, reducing the risk of losing tracking accuracy during long exposures.

Adjustable Prism Position for Flexible Guiding

To accommodate different telescope setups and imaging cameras, the ZWO Off-Axis Guider allows you to adjust the prism’s position. This adjustability ensures that the guide camera receives enough light while preventing any vignetting in your main imaging sensor. Whether you’re using a DSLR, a cooled astronomy camera, or a monochrome setup with filter wheels, the OAG provides the flexibility needed for optimal guiding performance.

Wide Compatibility with ZWO and Other Guide Cameras

Designed with ZWO cameras in mind, this Off-Axis Guider is compatible with most guide cameras featuring a standard 1.25” eyepiece barrel or M42 threads. It pairs effortlessly with the ZWO ASI120MM Mini, ASI290MM Mini, and other popular guide cameras, making it a seamless addition to your astrophotography rig.

Slim Profile for Easy Back Focus Management

One of the most significant challenges in astrophotography is maintaining the correct back focus distance, especially when using reducers, flatteners, or filter wheels. The ZWO OAG has an ultra-thin body thickness of just 16.5mm, allowing you to maintain proper spacing without exceeding your telescope’s back focus limits. This makes it an excellent choice for refractors, reflectors, SCTs, and Ritchey-Chrétien telescopes alike.

Easy Installation with Multiple Adapter Options

The OAG includes M42 and M48 thread adapters, ensuring compatibility with a wide range of imaging setups. Whether you’re using a dedicated astronomy camera or a DSLR, the included adapters provide a secure fit without the need for additional spacers. Installation is straightforward, allowing you to integrate the OAG into your system with minimal hassle.

Why Choose the ZWO Off-Axis Guider?

• Eliminates differential flexure by guiding through the same optical path as your imaging camera
• Reduces weight compared to using a separate guide scope
• High-quality 8mm prism for improved guide star detection
• Adjustable prism height for better framing and guiding flexibility
• Ultra-slim design (16.5mm thick) to maintain correct back focus spacing
• Compatible with most guide cameras and ZWO ASI Mini series
• Includes M42 and M48 adapters for hassle-free installation

The ZWO Off-Axis Guider is an excellent choice for any astrophotographer looking to enhance guiding accuracy without complicating their imaging train. Whether you’re capturing the fine details of distant galaxies or the delicate structures of nebulae, this OAG ensures that your tracking is as precise as possible.