LX7 - does its IQ compete with e.g. Sony RX100?

Started Apr 6, 2013 | Discussions thread
ultimitsu
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Re: LX7 - does its IQ compete with e.g. Sony RX100?
In reply to Jerry045, Apr 9, 2013

Jerry045 wrote:

I hate to jump in this fray, but there are two factors nobody seems to have considered.

First off there may be an efficiency difference in the respective sensors. In other words, how many electrons will be generated per each photon stricking the sensor. Some sensors may be more sensitive to light than others, and some will also differ in their signal to noise ratio. You can play with the semantics of the aperture, but what the sensor does with that illumination is what counts. We don't see this information on the respective spec sheets.

I assume LX7 is not too much of a sensor upgrade from LX5,

LX5 QE is 46%, mini read noise 3.8 (lower the better), well depth 9566 (higher the better)

RX100 QE is 52%, mini read noise 1.6 , well depth 10040.

http://www.sensorgen.info/

For the present purpose we can just assume sensor technology is the same. This is because most people can read reviews like DPR and get a basic idea of actual sensor size and aperture of these two cameras, such information is readily available. Sensorgen info is slightly more specialised and is not available soon after product launch.

Here's another thought, and I will leave the math to somebody much more dedicated. Let us say sensor "S" is larger than sensor "P". It also has more pixels. So, if we divvy up the larger sensor area into many more pixel spots, will each spot be larger or smaller than the other sensor having a smaller overall area but less pixels?

Sony's sensor is over twice the size while mp count is less than twice, so sony's pixels are larger.

But that in the grand scheme of things makes very little difference (other than maximum possible resolution)

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