W dniu 2015-01-11 o 14:25, Maciek pisze:
> Użytkownik Marek napisał:
>> W dniu 2015-01-10 o 21:40, Piotr Kosewski pisze:
>>
>>
>>> Rozmiar sensora to jedno, marketingowa nazwa to drugie.
>>> A wymiary aktywnej części sensora to coś zupełnie innego.
>>
>>
>> Rozumiem. Choć nie przypuszczałbym, że aż tak daleko marketing może
>> się posuwać.
>>
>>
> W cytowanym przeze mnie artykule z Dpreview usprawiedliwiano to
> wymiarami lamp analizujących jeszcze z lat 50 - stąd taka zaszłość.

Z wikipedii, hasło vidicon:

Tube sizes are always expressed in inches for historical reasons. A one
inch camera tube has a sensitive area of approximately two thirds of an
inch on the diagonal or about 16 mm.

Although the video camera tube is now technologically obsolete, the size
of solid state sensors is still expressed as the equivalent size of a
camera tube. For this purpose a new term was coined and it is known as
the optical format. The optical format is approximately the true
diagonal of the sensor multiplied by 3/2. The result is expressed in
inches and is usually (though not always) rounded to a convenient
fraction - hence the approximation. For instance, a 6.4x4.8 mm sensor
has a diagonal of 8.0 mm and therefore an optical format of 8.0*3/2=12
mm which is rounded to the convenient imperial fraction of 1/2 inch. The
parameter is also the source of the "Four Thirds" in the Four Thirds
system and its Micro Four Thirds extension--the imaging area of the
sensor in these cameras is approximately that of a 4/3 inch video camera
tube at appromimately 22 millimetres (0.87 in).

P.P.