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ISO on the R5

Started 10 months ago | Discussions thread
FingerPainter Forum Pro • Posts: 11,571
Re: ISO on the R5
2

BobKnDP wrote:

gossamer88 wrote:

FYI

Is this related to the person who posted some weeks back under the handle "vegetable"?

I presume that this is a trolling post.

Neither the post nor the video in it are trolling. Tony is perfectly correct.

The noisiness of an image depends on its Signal to Noise Ratio (SNR). The SNR depends primarily on how much light you captured in the photo. How much light you captured in the photo depends on the exposure, the surface area of the sensor, and the quantum efficiency of the camera. The latter two tend to be constants for a given camera. The exposure depends on:

  1. the amount of light in the scene reaching the lens (scene luminance) 
  2. the T-stop of the lens (approximated by f-stop), and
  3. the length of time the sensor is exposed to light (shutter speed)

The widely held view that the noisiness of an image depends on the ISO setting is an error caused by mistaking correlation for causation, and perpetuated by the omnipresent but fundamentally flawed conceptual model called the "Exposure Triangle".

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