T-Brand GOTO OnStep V4 – EXOS2 / EQ3D Equatorial Mount Tracking System

Take your astronomy and astrophotography sessions to the next level with the T-Brand GOTO OnStep V4 equatorial mount tracking system, compatible with the EXOS2 and EQ3D mounts. Powered by the open-source OnStep V4 controller, this kit delivers precise, automated celestial tracking and GOTO navigation — letting you locate and follow stars, planets, and deep-sky objects with ease.

Whether you're a seasoned stargazer or an enthusiastic astrophotographer, this system gives you smooth, accurate mount control via smartphone app, hand controller, or PC software. Available in 4 color options to suit your setup.

Key Features

OnStep V4 Controller: Open-source, feature-rich GOTO mount controller with a large object catalog for hands-free celestial navigation
EXOS2 & EQ3D Compatible: Designed as a direct upgrade or retrofit kit for popular equatorial mount platforms
Precise Tracking: Smooth stepper motor control for accurate sidereal, lunar, and solar tracking rates
Multiple Control Options: Works with the SynScan hand controller app, INDI, ASCOM, and other astronomy software
4 Color Options: Choose the version that matches your gear and personal style
DIY-Friendly Design: Straightforward installation makes this an accessible upgrade for hobbyists and enthusiasts

What's Included

GOTO OnStep V4 controller board
Compatible wiring harness/adapter (EXOS2 & EQ3D)
Instruction guide for installation and setup

Perfect For

Amateur astronomers upgrading existing equatorial mounts
Astrophotographers needing reliable, long-exposure tracking
STEM enthusiasts and telescope hobbyists exploring sky navigation

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Frequently Asked Questions

Q: What mounts is the T-Brand GOTO OnStep V4 compatible with?

A: The T-Brand GOTO OnStep V4 is designed to work with EXOS2 and EQ3D equatorial mounts, providing a straightforward upgrade path that replaces or augments the standard mount motor system with a smart GOTO controller.

Q: What is OnStep and how does it work?

A: OnStep is a popular open-source telescope mount controller. The V4 board uses stepper motors to drive your equatorial mount, allowing automated GOTO navigation to thousands of celestial objects. It connects via WiFi or serial to apps like SkySafari, INDI, or ASCOM-based software on your PC or smartphone.

Q: Is the OnStep V4 difficult to install on an EXOS2 or EQ3D mount?

A: The T-Brand OnStep V4 kit is engineered for compatibility with EXOS2 and EQ3D mounts, making installation approachable for hobbyists with basic electronics knowledge. The package includes wiring guidance, and the active OnStep community offers extensive documentation and support online.

Q: What tracking rates does the OnStep V4 support?

A: The OnStep V4 supports sidereal, lunar, solar, and custom tracking rates, making it versatile for both visual astronomy and long-exposure astrophotography sessions.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.