It has features like auto focus and zoom. It can keep the shutter open for long periods of time. This allows photos to be taken in subway stations. These have incredibly high resolution, about 4.5k pixel by 3k pixel. Most photos were take with the forementioned Canon.
Some older photos are scans from prints.
These are of noticeably lower quality and are being phased out. The oldest set of photos were taken from 1986 to 1988 using a Kodak disc camera. Disc film was an example of marketing attempting to triumph over results. Later a Kodak K80 35mm camera was used. 35mm film is a far better medium for photographs.