Four Thirds
May 11, 2013 00:38:22 #
May 11, 2013 00:50:38 #
Its the ratios of a sensor size. "4:3" which means the sensor is 4 increments wide and 3 increments tall (i.e., 20mm x 15mm)
May 11, 2013 01:08:25 #
Each size sensor has its own designator. Most DSLR cameras contain APS-C size sensors. A Four Thirds System sensor is 17.3-mm wide x 13-mm high. Here is a comparative chart.
May 11, 2013 05:13:50 #
Yeh but explain this
3/3 = 1 or a whole
1/2 + 1/2 or 2 halfs = a whole
so mathematically 4/3 = 1 and 1/3 !!!!!
3/3 = 1 or a whole
1/2 + 1/2 or 2 halfs = a whole
so mathematically 4/3 = 1 and 1/3 !!!!!
May 11, 2013 12:13:51 #
May 11, 2013 12:14:29 #
May 11, 2013 12:18:37 #
May 11, 2013 16:14:25 #
JR1 wrote:
The term is "Four Thirds System". It is not a mathematical formula.Yeh but explain this . . . 4/3 = 1 and 1/3 !!!!!
May 12, 2013 04:36:16 #
Nikonian72 wrote:
The term is "Four Thirds System". It is not a mathematical formula.
That is what I believed, in fact that being true it really means nothing, and could have been called baked bean/fish, but people DO believe 4/3 means something
May 12, 2013 06:26:30 #
lindmike: Think about is this way. In the old days, your television was 4:3 ratio, 4 units wide by 3 units tall. When you look at one of today's wide screens, the ration is 16:9 a lot wider than it is tall.
Steve
Steve
May 12, 2013 06:32:27 #
When quoting aspect ratios, the convention is to give the horizontal value followed by the vertical value, where the values used are those which give the simplest (i.e. lowest) ratio, expressed either in the form length:height or length/height.
The same convention is used in TV, film, photography and others. In photography, the actual dimensions of a picture may be used for this purpose i.e. 8" x 10", which may be referred to more concisely as 8x10. But as an aspect ratio, 8:10 can be expressed more simply as 4:5. With enlargements, the convention seems to be to use the actual dimensions (often given in inches).
4/3 is just one way of expressing the aspect ratio 4:3.
The same convention is used in TV, film, photography and others. In photography, the actual dimensions of a picture may be used for this purpose i.e. 8" x 10", which may be referred to more concisely as 8x10. But as an aspect ratio, 8:10 can be expressed more simply as 4:5. With enlargements, the convention seems to be to use the actual dimensions (often given in inches).
4/3 is just one way of expressing the aspect ratio 4:3.
May 12, 2013 06:47:42 #
As well as the above, the 4/3" designation comes from the now obsolete way of indicating sensor size. In the days of vidicon tubes, the 4/3" referred not to the actual sensor size but to the diameter of the tube needed to contain that size of sensor.
May 12, 2013 12:30:08 #
Thanks, Steve. That explains it, and now I know it's just another reference to the sensor size.
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.