Yes they do. But they do not have a R5a.
What would an R5a really offer that the Ra does not for astronomy?
Eye AF is useless for astro work.
Faster frame rates are useless for astro work.
IBIS isn't useful if one is using a tracking mount.
8K video is useless for astro work.
Smaller photosites (i.e. higher resolution) aren't that much more useful for anything but planetary astro work.
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