I’m excited to share my thoughts on the Gemini Electronic Auto Focuser (EAF). In this post, I’ll discuss what I love and hate about this budget-friendly electronic focuser designed for astrophotography.
What is the Gemini EAF?
The Gemini EAF is an affordable alternative to more expensive focusers like the ZWO EAF. It’s designed to automate the focusing process for telescopes, making it easier to achieve precise focus during astrophotography sessions. If you want pinpoint focus without spending a fortune, this is for you. The Gemini EAF is compatible with various software platforms, including ASCOM, NINA, KStars, and more.
Unboxing and Installation
I ordered the Gemini EAF from AliExpress for about $70 USD. It arrived well-packed in a plain brown box, including all necessary attachments and screws to fit most common telescopes. However, the package did not include a screwdriver for the grub screws, which would have been a nice addition.
Build Quality and Features
The Gemini EAF has a robust build quality, although some users have mentioned that the ZWO bracket is slightly better. The focuser includes a temperature probe, which is thicker than the one provided by ZWO, potentially offering better durability.
Key Features:
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- Powered by USB (5V)
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- Support for ASCOM and INDI
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- Wide compatibility (I’ve been using it with NINA without any issues)
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- Three-gear precise control handle
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- Maximum control distance of 5 meters
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- 3840 steps per lap, with a maximum travel of 2 million steps
Performance
In terms of performance, the Gemini EAF provides precise control over the focusing mechanism, allowing for accurate adjustments. The temperature sensor is reasonably accurate, which is crucial for maintaining focus during long imaging sessions.
Drivers
The Gemini EAF uses ASCOM drivers, which are available for download. However, the download link is a private Google Drive, which seems a bit unprofessional. Despite this, the drivers work fine. It’s also worth noting that the focuser has some minor backlash, but this is common in all types of focusers. Overall, it performs just as well as the ZWO EAF.
Overall Value
One of the standout aspects of the Gemini EAF is its affordability. Priced at around $70 USD, it offers excellent value for money, especially for those looking for a budget-friendly option without compromising on performance.
Conclusion
The Gemini EAF Electronic Focuser is a reliable and cost-effective solution for astrophotographers seeking automated focusing capabilities. Its ease of installation, robust build quality, and compatibility with various software platforms make it a worthy investment. While it may not have the premium feel of more expensive models, it delivers excellent performance for its price point.
