Please, read this link: AstrotracerImagine a 20 minute exposure. That's 5 degrees of image shift at worst (at the celestial equator, less nearer the poles). With a wide or normal lens that is very little cropping to essentially "stack" a long sequence of exposures. For telephoto, it means that a tracking mount is not alignment critical. Notably, a smart system may well accommodate even rotational drift, and could include lens profiles to convert to a sprical projection for each image and then back to flat..
If you read it, you will notice the author finds they can get 4 minute tracks with excellent results. That's not 20 minutes. But what they get in 4 minutes is beautiful. Also, they mention they do have some issues with extremely wide angle lenses and mention the lens ranges that do work reliably.
Also, Olympus added star focusing and tracking in their new EM1mark3.
There's a lot of various ideas & features are being talked about here, that are already working in other cameras. If Canan simply copied & improved what has been done before then they could have the best of all of them. They have spectacular lenses & new bodies & sensors. The rest is "Just a firmware update away!"
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