Are bigger pixels less noisy?

Started 5 months ago | Discussions thread
J A C S
J A C S Forum Pro • Posts: 19,325
Re: Are bigger pixels less noisy?

Futax wrote:

Aren't specialised "low-light" cameras lower in pixel-count because fewer pixels implies lower read noise from the electronics?

This has been discussed already.

Here, the so-called low light champions A7S2 and A7S3 have the highest input referred read noise at ISO 100 compared to higher mp Sony cameras in the last few years. This does not mean the worst S/N because of the different pixel size.

At high ISO, the situation reverses but then Sony applies dual gain, who knows how that is tuned.

@ 57even:

I think a larger signal per-pixel also makes it easier to perform noise filtering at high ISO (ie the 'extended' range) where the signal from smaller pixels would be closer to or even below the noise floor and therefore not recoverable.

What matters is per pixel S/N related to the pixel count in the well known way.

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