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Most sizes of VESA mount have four screw-holes arranged in a square on the mount, with matching tapped holes on the device. The horizontal and vertical distance between the screw centres respectively labelled as 'A', and 'B'. The original layout was a square of 100mm. A 75 mm × 75 mm (3.0 in × 3.0 in) was defined for smaller displays.
The Predicta was marketed as the world’s first swivel-screen television. Designed by Catherine Winkler, Severin Jonassen and Richard Whipple, it featured a picture tube that separated from the rest of the cabinet. [1] [2] [3]
The tube was mounted vertically in the bottom of the cabinet with the screen pointing downward towards a concave mirror which reflected the image upward toward an angled mirror at the top of the cabinet onto the 25 inch screen, The top of the tube mirror box had a Schmidt lens [e] to correct aberrations. Because the picture had to be magnified ...
The display is mounted on a fully-articulating hinge that itself is attached to a tilting plate. Such display can be extended out from the back of the camera, ensuring it stays clear of the camera's left-mounted ports when flipping it out to the side. This type of articulating screen is called tilt-and-articulating screen.
A good example of this a 4×6 print (6 inch wide by 4 inch tall landscape) perfectly matches the 3:2 aspect ratio of a DSLR/35 mm, since 6/2=3 and 4/2=2. For analog projection of photographic slides, projector and screen use a 1:1 aspect ratio, supporting horizontal and vertical orientation equally well.
A Nikon CoolPix 900 (1998), an early swivel-lens design. A swivel lens is a lens that freely rotates while attached to a camera body. They are used on some compact digital and video cameras . These lenses make it easy for a photographer to aim a camera without moving around too much. Swivel lenses come in different sizes and shapes.