The highlight, though not the last, of the globular cluster series: Messier 13 – The Great Globular Cluster in Hercules.
I finally dedicated an entire evening (or rather, night) to this object and captured nearly 50 exposures, each 300 seconds long.
My Cassegrain telescope was still very well collimated, obviously. I’m definitely satisfied with the result.
This was my fifth session photographing this globular cluster using different telescopes and camera configurations. In my opinion, it’s definitely the best photo of Messier 13 I’ve taken so far.
High-resolution on Astrobin:
The annotated image:
Session Details:
| Telescope | Vixen VC200L – VISAC |
| Focal Length | 1800mm |
| Erecting Lense | – |
| Camera | Canon EOS R(a) |
| Filter | Bayer Matrix RGGB |
| Mount | Skywatcher HEQ5 Pro, Belt and Hypertuned |
| Guiding Equipment | APM 240mm |
| Guiding Camera | ToupTek GPM462M |
| Photography Date | 05/19/2025 |
| Exposure-Time Lights | 50x300s |
| Correction frames | FLATS, BIASES, DARKS |
| Sensitivity | ISO 1600 |
| Processing Date | 07/10/2025 |
| Software Stack | Stellarmate OS, PixInsight, Affinity Photo |
| Capture Place | Koblenz, Germany |
