A Skymax 127 Maksutov was mounted on a Celestron AVX GOTO mount. A Canon EOS 4000D DSLR was placed at the Cassegrain focus and was USB-tethered to a laptop running Fedora Linux and AstroDMx Capture for Linux. AstroDMx Capture controls the DSLR just like any other astronomy camera. Every setting of the camera can be set from the software, which then captures the specified number of images with the specified ISO and exposure values, and stores them on the computer, not on a camera SD card.
45s exposures were captured of M13 with matching dark-frames.
Screenshot of AstroDMx Capture for Linux capturing exposures from the USB tethered DSLR
The best 23 images were stacked and dark-frame corrected in Deep Sky Stacker.
The resulting image was post-processed in The Gimp 2.10, Affinity Photo and Neat image.
M3
Closer view
