![]() ![]() The size of video camera tubes is simply the overall outside diameter of the glass envelope. That is the actual physical diagonal of our modern 1-inch sensor. The important part – the “sensitive area” – of such a tube was around 0.63″ (15.9mm) in diameter. A widely used diameter of the tubes was, you guessed it right, 1-inch. The bigger the diameter of the tube, the more light it could capture. These cathode-ray tubes in the early TV cameras are actually the reason why until today companies use the term 1-inch sensor. An interesting side note – there was no way to record the image in the early days of TV. I am sorry for this oversimplified explanation, but if you are interested in this technology, please do watch the whole Veritasium video. These rays of electrons either captured or projected an image line-after-line. These tubes were constantly sending and/or receiving a ray of electrons that got bent by electrical magnets. The hearts of these cameras, as well as televisions back then, were cathode-ray tubes (shortly CRT). These first cameras designed for live broadcasting obviously did not have a film stripe inside. For this segment, Marques borrowed a few nice animations from the Veritasium Youtube video called “How Was Video Invented?” I recommend watching the whole video if you haven’t seen it yet as it is really interesting and shows how much progress our industry made over time. To understand the “why” behind this confusing practice, we need to go way back to the beginning of broadcast cameras. Source: mkbhd The history of the term “1-inch sensor” Why is it called a 1-inch sensor then? Real size of 1-inch sensor. For example a 1/2″ sensor does not feature a physical diagonal measurement of 1/2″, but is in fact much smaller. This also applies to every sensor size that is derived from it. Every image sensor marketed as 1-inch sensor measures 0.52″ (13.2mm) on the long side, 0.35″ (8.8mm) on the short side, and 0.63″ (15.9mm) diagonally. Let’s start with defining the real size of a 1-inch sensor. As I think Marques summarizes the topic quite well, I decided to write a short article about it. A large portion of the video (from 07:48) is dedicated to the 1-inch sensor situation as a way of manufacturers giving us misleading information. In one of his latest videos, the Tech-Youtuber Marques “MKBHD” Brownlee talks about cases when tech companies lie to us (customers). keyboard_arrow_rightGear Guides by Budget.keyboard_arrow_rightGear Guides by Type.keyboard_arrow_rightCameras of the Year.Timbers with smooth surfaces on all four sides generally lose thickness and width, resulting in a smaller size. As thin layers of timber are sliced away during planning, its thickness shrinks, resulting in a thin edge. ![]() In order to smooth out the surface of timber, it is put through a planer on both sides so that it has a uniform thickness. Timber that is still green or fresh has a rough surface. This process results in the board shrinking. ![]() Typically, a plank is measured as it is in its original shape, but the lumber we purchase has been smoothened during the manufacturing process. Actual size is what the exact measurement of the lumber would be now, the Nominal size is Why is the actual size of a 1 x 1 lumber smaller than its nominal size? 1×1 lumber dimensions 1×1 lumber Nominal size in inches Actual size in inches Width 1 Width 3/4 Height 1 length 3/4 1×1 Lumber Nominal size in mm Actual size in mm Width 25.4 19.05 Height 25.4 19.05 ![]() In order to find out the exact dimensions, it’s best to do some quick measurements. For example, an 8 feet long board will have an 8 feet actual length, the same is true with other sizes such as 6 feet, 10 feet, 4 feet, etc. Home Depot and other local hardware stores sell lumber that has smoothed and planned edges.Ī 1×1 board has the same length regardless of its actual or nominal size. Logs that are sawn from trees are rough and have rough edges. Nevertheless, hardware stores call it 1-by-1 lumber despite the incorrect nominal size due to the standard measurement. In fact, it’s smaller than what the nominal measurements indicate. Actual dimensions of 1 x 1 lumber are 3/4 x 3/4 (19.05 x 19.05 mm). ![]()
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