How about shooting the night sky with Canon 550D?

No problem at all. The picture you posted was taken with a wide-angle lens. Use a tripod at night, the aperture is small, and the head can also shoot the above effect, 550D is no problem.

But if you want to take a close-up of the moon or other planets, the focal length of the sleeves will be shorter, and astrophotography is another theme.

Just shooting a wide range of night sky, 550D+ 18-55+ tripod+wired release is no problem.

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