knro Thank you for your suggestions.

1) The command of gPhoto2 that I tried is the following.
gphoto2 --capture-image
You can release the shutter correctly.

gphoto2 --capture-image-and-download --filename /tmp/hoge.jpg
The shutter was released correctly, and the file was transferred from the camera to the specified folder on the Raspberry Pi4 and saved.

gphoto2 --summary
This command also works.
The result of this command also seems to show the settings, so I attach it as a precaution.

In the past log, I also saw an article about EOS M6, which is a mirrorless, but it was not clear whether it was solved or not. I hope that I can use it for shooting the starry sky without replacing with a new camera.

Thank you. Yuji

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