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Reciprocal Dimensions of Sensor Sizes.

greenwing

Yorkshire, UK
1304 posts

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"RE: Reciprocal Dimensions of Sensor Sizes."

greenwing Registered since 18th May 2006
Tue 14-Aug-12 08:45 PM | edited Tue 14-Aug-12 08:50 PM by greenwing

>Forgive my posting this where it doesn't really belong, but I
>can't find a more suitable location - anyway I do at least own
>200 and 300s bodies!
>
>I can't understand what exactly is meant when sensor sizes are
>quoted as (say) 1/2.55 inch. Does this mean one dimension is
>0.392 inch? In which case, which dimension is it, the short,
>the long, or the diagonal?
>
>I just saw a Sony camera sensor described at 1/3.91 inch. How
>opaque can they get? I would be greatful if anyone can confirm
>to me that these measurements are indeed reciprocals, and in
>this case the Sony sensor is 0.2556 inch or 6.5mm in some
>unspecified dimension!
>
>Mnay thanks for any guidance.

The 1/2.55 dimensions are archaic, and I have no idea why they keep on going in this era. It's a reference to the outer diameter of a video camera tube, so it doesn't directly relate to anything about the digital camera it describes. So that 1/3.91 Sensor refers to a tube of 6.5mm outside diameter, so the sensr itself must be a little smaller, maybe 6mm diagonal. See Wikipedia

Should read en.wikipedia.org/wiki/Image_sensor_format, but the "form" gets lost somewhere.

Chris

A general, generic topic Reciprocal Dimensions of Sensor Sizes. [View all] , Bert Shelton , Tue 14-Aug-12 05:07 PM
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