I post too Much on Here!!
- Jul 21, 2010
angrykarl said:neuroanatomist said:3kramd5 said:Even if you review two photos at sensor dimensions, i.e. no enlargement (the digital equivalent of a contact print), your noise performance will be better with the larger sensor, given the same exposure time and t-stop with a format-appropriate image circle (focal plane exposure) and the same composition. Why? You sampled the scene with more photons, thus generating more charge and requiring less amplification when digitized to a standardized output signal.
How do differently-sized image constitute a standardized output?
The image is not differently-sized. You've got the same shutter speed, t-stop, composition, resolution,
equivalent focal length, just different size of sensors. The resulting images are equal sized.
Please read the part highlighted in red above, which clearly states that images of different sizes are being compared.
He wrote "standardized output signal". Signal is electric charge from collected photons in one photosite. Which results in one pixel brightness. Raw collected signal is smaller, but according to ISO the brightness must equal, therefore there must be amplification.
We’ve already been down the rabbit hole of comparing pictures (i.e. the image from a whole sensor) versus comparing pixels. They are not the same.