DIY harmonic mount for astrophotography

Astrophilos has released a video that introduces an innovative DIY harmonic mount designed to make astrophotography more affordable for enthusiasts on a budget. This new version, costing only $399, brings impressive advancements and highlights for those interested in building their own mount while saving money compared to commercial options.

DIY harmonic mount for astrophotography

The video begins with an introduction to version two of the harmonic mount, which has been redesigned for better portability and ease of use. Unlike the previous version, where components were housed separately, the new version integrates everything into a single, compact enclosure. This change not only reduces bulk but also makes transportation and handling more convenient for users. A notable improvement is the incorporation of the OnStep software platform, which controls the DIY mount and features Tasom drivers, offering the same capabilities as a commercial mount. OnStep allows users to control their mounts with precision and is considered a DIY alternative to the popular SceneScan system.

Another significant update is the inclusion of a green laser module for polar alignment. This addition makes it easier for users to achieve accurate polar alignment, which is essential for precise astrophotography. The mount can now also be attached to a tripod or polar wedge using a standard VX and D-tail, improving the overall versatility of the system. Astrophilos recommends using software such as Nina or KStars for additional guidance and alignment assistance.

Limitations of the mount

Despite the impressive features, the video discusses several limitations of the mount. One drawback is that the mount's accuracy is slightly less than the original version due to the decision to use a direct harmonic drive without any additional reduction mechanism. This results in a tracking accuracy of about two seconds. While this may seem like a disadvantage, Astrophilos emphasizes that it is still manageable, especially due to the low reduction. Additionally, the mount has a limited payload capacity. It can handle about 15 pounds without a counterweight, and up to 20 pounds with a counterweight. Users are advised to exercise caution when powering off the mount with a telescope attached, as there is no braking mechanism to prevent potential issues.

On the positive side, the mount offers an exceptional price point, especially for those willing to source parts from places like AliExpress. The total cost of building the mount is around $400, which includes components such as the OnStep board ($30), TMA 17 motors ($30), harmonic drivers ($250), and a green laser module ($5). For those looking for a more durable enclosure, Astrophilos suggests using an aluminum version, which can be obtained through the sponsor PCBWay. The DIY approach allows enthusiasts to build the mount themselves, with Astrophilos estimating that the assembly process takes about 30 minutes if all the components are on hand.

Key advantages of this version

Weight is another key advantage of this version. The V2 model is around 5 pounds, making it approximately 30% lighter than the previous design. This reduction in weight improves the overall portability and ease of use of the mount, which is especially beneficial for those who plan to transport it frequently for astrophotography sessions.

The video concludes with an invitation to follow along with future episodes, where Astrophilos will guide viewers through the step-by-step assembly process and provide test results using the mount under the night sky. The entire design, including the software and components, is open source and free to use, allowing the community to benefit from this cost-effective solution for astrophotography.

The DIY harmonic mount provides an affordable and lightweight solution

The DIY harmonic mount provides an affordable and lightweight solution for budget-conscious astrophotographers, with a total build cost of just $399. While it may not offer the same level of precision and payload capacity as higher-end mounts, its cost, ease of assembly, and open-source nature make it a compelling option for hobbyists looking to get into astrophotography without breaking the bank.