dmc-FZ100K

Started Jul 17, 2010 | Discussions thread
Wellington100 Forum Pro • Posts: 11,049
Re: backside illuminated

I read an article in a magazine about back illuminated sensors which said that the reason they were developed is because the internal circuitry and wiring of a sensor sits between the top where the light enters the sensor and the bottom where the actual light sensitive area of the sensor is.

On small 1/2.33 sensors this means that 30% of the light is lost due to it hitting the wiring on its way through the sensor. By simply turning the sensor around, the wiring is avoided and there is a 30% gain.

The reason its not an issue on larger sensors is that the amount of circuitry and wiring does not increase proportionally as the sensor size increases so the effect of the wiring becomes negligible at larger sizes of censor so there is no point turning it around.

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