4 ms·

>Cell phone cameras are multiple stops slower than "real" cameras (i.e. they take in 1/4 to 1/8th as much light). this is not true. the iPhone camera's sensor

>Cell phone cameras are multiple stops slower than "real" cameras (i.e. they take in 1/4 to 1/8th as much light). this is not true. the iPhone camera's sensor receives the same density of light from its f/1.8 lens than any old traditional camera using an f/1.8 lens. this means the stops are identical. of course the total amount of light that passes through the iPhone's lens is much smaller than a normal camera's, but that has no bearing on the photo's exposure. the real difference rests in the signal to noise ratio, which is determined by pixel density, and that's why smartphone photos are incredibly noisy.

camillomiller 4y ago
This
- twoWhlsGud 4y ago
  That: https://www.dpreview.com/articles/2666934640/what-is-equivalence-and-why-should-i-care https://www.dpreview.com/articles/2666934640/what-is-equival...
asdfasgasdgasdg 4y ago
You mentioned that the stops are identical, but then you said that the phone photos are noisier at the same ISO. You didn't mention this, but there will also be a deeper focus plane. So they aren't identical -- at least under the sense of the word "identical" that's useful to me. You need to use a much slower shutter to get the same noise level. Or a much faster aperture at the same shutter speed. That difference is exactly what I'm talking about. You'll generally find that a cell phone photo has about the same noise once if you divide the ISO by the square of the relative crop factor (and set exposure accordingly). Coincidentally, you also need to use an aperture that's faster by the relative crop factor to get the same level of background blur.
- HidyBush 4y ago
  I never claimed taking photos on a minuscule sensor with a plastic lens is identical to doing so with a high end DSLR. Stops refer to exposure and noise and depth of field have no bearing on a photo's correct exposure. It seemed to me that parent was spreading a common misconception about how exposure works across different sensor sizes so I wanted to correct/clarify that. The whole topic of noise equivalency or depth of field equivalency is completely separate and I just mentioned it to make it clear what part of a camera influences which characteristic (light density for exposure, pixel density/pixel size for noise, sensor size for depth of field)

camillomiller 4y ago

This

twoWhlsGud 4y ago
That: https://www.dpreview.com/articles/2666934640/what-is-equivalence-and-why-should-i-care https://www.dpreview.com/articles/2666934640/what-is-equival...

asdfasgasdgasdg 4y ago

You mentioned that the stops are identical, but then you said that the phone photos are noisier at the same ISO. You didn't mention this, but there will also be a deeper focus plane. So they aren't identical -- at least under the sense of the word "identical" that's useful to me. You need to use a much slower shutter to get the same noise level. Or a much faster aperture at the same shutter speed. That difference is exactly what I'm talking about. You'll generally find that a cell phone photo has about the same noise once if you divide the ISO by the square of the relative crop factor (and set exposure accordingly). Coincidentally, you also need to use an aperture that's faster by the relative crop factor to get the same level of background blur.

HidyBush 4y ago
I never claimed taking photos on a minuscule sensor with a plastic lens is identical to doing so with a high end DSLR. Stops refer to exposure and noise and depth of field have no bearing on a photo's correct exposure. It seemed to me that parent was spreading a common misconception about how exposure works across different sensor sizes so I wanted to correct/clarify that. The whole topic of noise equivalency or depth of field equivalency is completely separate and I just mentioned it to make it clear what part of a camera influences which characteristic (light density for exposure, pixel density/pixel size for noise, sensor size for depth of field)