Best DSLR or ILC for Night Sky Imaging?

Started Nov 8, 2017 | Questions thread
sharkmelley Senior Member • Posts: 2,152
Re: Sony A7S

bclaff wrote:

sharkmelley wrote:
... Imagine a camera where you have the choice between pixels of 4 microns or of 8 microns. The per pixel read noise in either case would be the same since they use the same readout technology...

This is probably an erroneous assumption.

To maintain the same Full Well Capacity (FWC) per unit area the pixels will have different capacitors and the noise from the pixels will not be the same.


Sure, I would expect the FWC per unit area to be maintained.

I was making the assumption (perhaps wrongly) that the accumulated charge from each pixel would go through the same ADC and so would suffer the same read noise.

Do you know what the effect might be on read noise of decreasing pixel size?


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