Samsung S20 ultra comparison

Started 6 months ago | Discussions thread
RDM5546 Senior Member • Posts: 1,303
Re: Samsung S20 ultra comparison

Jostian wrote:

Lee Jay wrote:

Jostian wrote:

Lee Jay wrote:

Jostian wrote:

Lee Jay wrote:

Jostian wrote:

Lee Jay wrote:

Jostian wrote:

Downsizing destroys the advantage of more pixels. Why not downsize to one pixel?

More pixels is great for cropping yes not for comparing the quality of output though.

That's the entire point of doing the comparison!

you are much mistaken to think more megapixels equals better IQ!

Then why does the inventor of our modern CMOS sensors (Eric Fossum) agree with me?

"Being developed at Gigajot, QIS is the next generation of image sensors where high-speed single-photon detection is used to unlock new image capture capabilities for consumers and professionals not possible with today’s devices."

"Jot" is the specialized pixel that is sensitive enough to detect a single photon of light."

"A QIS may contain hundreds of millions to billions of jots."

so a 12mp sony FF has poorer quality IQ than a 108mp Xiaomi??

Sensor size also matters because of total light collected at a given f-stop and shutter speed.

Obviously... but you specifically said MPs are all that matters!

Show me where I said that they were ALL that mattered.

apologies, you didnt say ALL but you said the more megapixels equals better IQ which is not true, unless (theoretically) all else is equal. But the review section is full of reviews (even cameras with same size sensors) where cameras with lesser MPs deliver better IQ.

However, if the 0.8micron pixels from the 108MP sensor were scaled up to full-frame,

But they are not, they are tiny 0.8 micron, you could say the same about any smaller sensor...

No, I'm saying leave the pixel size alone and scale the sensor up.

but you cannot do that above 100% crop 1:1, thats the point and thats why DPReview always use the sensor with the least MP as a base to which other sensors with more MPs get resized to in their studio scene!!

then you'd have a 1.35GP sensor that would out-perform that 12MP Sony in all but the most light-starved situations.

any idea how much light you'd need,

The same. The total light captured doesn't change.

exactly, but when that same amount of light needs to be spread across 12 mp vs 108 mp it makes a huge difference.

in anything but ultra bright light the 12MP Sony will be better

Not true. It's a total myth that larger pixels are better in low light, except for a very extreme situation where each pixel is only gather a couple of photons (where the read noise dominates the shot noise).

You are wrong, a 0.8 micron pixel will NOT gather the same amount of light as a 3.8 micron pixel.

, but again that goes against what you stated earlier saying that more MP's equals better IQ

Because, all else being equal, it does.

but camera's and phones are not, you are overly theoretical, there are many reviews where lesser MP cameras delivered better IQ than same size sensors with more MPs...

But ok we are hijacking this thread, lets just agree to disagree

There is a shot noise signal to  limit in a pixel equal to the square root of the maximum capacity of electrons that can be stored in a pixel. If a pixel can store 1,000,000 electronics there is a maximum signal to noise ratio of 1000:1  (120 decibels).   The storage capacity of a pixel increases with the surface area of the the pixel. So if the pixel with a 1,000,000 electrons capacity is doubled is height and width stores 4,000,000 electrons then this 4 fold increase in size will improve the signal to noise ratio to 2000:1.

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