Hi and welcome to the forum:
Canon don't make specific adapter for celestial telescopes, so normally you approach it from the telescope maker, however a 30 second search on Google produced this:
How to Attach Your Camera to a Telescope | Easy to Follow with Examples (astrobackyard.com)
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
