It is not exactly 1/diagonal measurement. It comes from an old video
tube standard for size designation.
2.5 is larger than 1.8 but it is opposite for the reciprocals.
Good explanation here:
http://www.dpreview.com/learn/?/Glossary/Camera_System/
sensor_sizes_01.htm
Winsor
Long Beach, California, USA
On Mar 27, 2007, at 10:40 AM, Scott Peden wrote:
>
> isn't the 1/diagonal measurement?
>
> So that 1/1.8 is smaller than a 1/2.5?
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