Incredible low-light video footage from Canon

Started Mar 4, 2013 | Discussions thread
JJ Rodin
Contributing MemberPosts: 588
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Re: Incredible low-light video footage from Canon
In reply to Felix11, Mar 5, 2013

For someone who knows a little about silicon & chips, the more silicon area you have the more potential for noise, more=more. It is almost that simple.

Silicon is a conductive material (ie electrons are easily freed and produce an electrical signal), and extraneous EMI/EMF (all the electrical crap flying around in the air - cell phones, sun, broadcast towers, earth, etc) will hit silicon and free up electrons (noise), unless very well shielded, and consumer chips are NOT that well shielded (why do you think NASA/space electronics are so expensive, MASSIVE shielding, not only for noise but to NOT get fried by gamma rays and such !!).

Whereas when using the minscule sized pixels (photo diodes) in 18mp 1/2.3" sensors, the noise can be greater than the signal (signal to noise ratio).

IOW, the electrical energy converted due to the desired photon produced electricity is not much more or even less than the random noise in the silicon layers caused by many factors.

That is why Sony has to 'watercolor' their 18mp 1/2.3" sensors because it is a noisy mess, even 12mp Canon sensors have lots of noise, you do have to use NR to compensate for sharpening quite a bit !

It is always about signal to noise, look at knowledge, how much 'crap' do you know that you would just a well like to flush away! But you can't!

Well signal is what we want, until some new unknown physics/material/tech occurs, NOISE will have to be dealt with, so just ask her to 'be quiet' more often!

Felix11 wrote:

Canon says:

"In addition, the sensor's pixels and readout circuitry employ new technologies that reduce noise, which tends to increase as pixel size increases"

Which is interesting because people generally think that noise is greater with smaller sensor elements.

Are Canon marketing just being clever here by using noise when we will read what they mean in terms of signal to noise ratio?

SNR must be very high on this sensor, nonetheless the noise will also be slightly higher due to increased sensor element area or border - is that correct?

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