If a third number is added onto the nominal dimensions, such as 2 x 4 x 96, it indicates the length of the wood. be referred to by its nominal size in inches, which means the actual size. The typical nominal dimensions for wood, such as 2 x 4, refer to the thickness and the width of the wood. More background in this archived article. Dimension lumber is solid sawn wood (less than 3.5 inches in thickness) and. Usually, there's a little variation and sensor-makers round to the nearest somewhat-standard fraction, but occasionally, as with the 1/1.83" Nokia N8, a very-specific number is given, in which case it's almost certain that they're following the 1" = 16mm rule literally. This rule matches the 1"-format designation for this sensor: 13.2mm × 8.8mm has a diagonal of 15.9mm, and you can see how it roughly applies to the other typical compact digicam formats as well. 1/2.5" - use the corresponding fraction of 16mm. It is much easier to say Gimme a 1 x 4 than it is to say Gimme a. Or, for formats smaller than an inch - very typical, e.g. The standard finished size is 3/4 x 3-1/2. (Yes, it mixes imperial and metric measurements.) So, for each "inch" in a sensor format designation, translate that to approximately 16mm of sensor diagonal. So, from way back then, there's a concept called "the rule of 16", which says that the usable, actual sensor diagonal for a 1" tube is 16mm. These were measured in inches diagonal, but for various practical reasons, the entire circle isn't used. 2 x 8 x 8' Red Cedar S4S Lumber (Actual Size 1-1/2' x 7-1/4' x 8') Model Number: 1072943 Menards SKU: 1072943 Final Price 48 94 each You Save 6. Chart by Moxfyre under the CC-BY-SA license. The Wikipedia page on sensor sizes has this chart: which doesn't really help. How does that work That's a pretty small inch. Digital camera sensor format-size names have their roots in television camera tubes. The Sony RX100 reportedly has a sensor size of 1' which is 13.2 x 8.8 mm according to the press release and various sites.
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