Sensor Size

[paul_brenner1]

<p>I'm not really a beginner, but wasn't sure where else to post this:<br>

I've seen many sensor size comparison charts, and understand most of the descriptions (e.g. 1/2.5", 1/1.7", etc.) but I'm seeing some cameras listing size as simply 1" or 1.5" (the latter for the G1-X for example). Canon says the 1.5" is "80% of APS-C" but that doesn't help me relate it to other sensor sizes smaller than APS-C. And I've seen nothing on the 1" size.<br>

Can anyone help me?<br>

Thanks,<br>

Paul</p>

[phule]

<p><a href="http://1.static.img-dpreview.com/reviews/sony-cybershot-dsc-rx100/images/Sensor-Sizes.png?v=2879">http://1.static.img-dpreview.com/reviews/sony-cybershot-dsc-rx100/images/Sensor-Sizes.png?v=2879</a></p>

[paul_brenner1]

<p>Thanks Rob! I've seen a number of charts but this one nails it!</p>

[john_wheeler6]

<p>Hi Paul<br>

- Here is another link with a bit more detail: http://www.gizmag.com/camera-sensor-size-guide/26684/<br>

- The number given and its background is the Optical Factor or OF: http://en.wikipedia.org/wiki/Optical_format<br>

A more simplified formula for the OF is the diagonal of the sensor in inches multiplied by 1.59. This number is then rounded to number or fractional number. Background of sizing comes from vacuum tube image sensors or CCTV cameras. <br>

Why we still use the very old approach baffles me (unless there is some confusing marketing reason) :)</p>

[paul_brenner1]

<p>Thanks for the info, John!</p>

[john_wheeler6]

<p>You're welcome Paul.</p>