Sony was not a major player in the film camera market before beginning to make digital cameras.
The History of Sony Cameras
This month in digicam history: The DSLR goes mainstream, Sony gives smartphones a shot in the arm, and one seriously tiny camera debuts
Sony Group Portal - Product & Technology Milestones−Digital Camera
Sony camcorders - Wikipedia
History of Sony Company
sonyalpharumors – Page 831 – Sony Digital Camera News
Sony Group Portal - Product & Technology Milestones−Digital Camera
Sony Group Portal - Product & Technology Milestones−Video Camera
Using Vintage Lenses on Sony Cameras (Easy!) - Sony Photo Review