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2023 big year for Fuji?

Started 2 months ago | Discussions thread
Truman Prevatt
Truman Prevatt Forum Pro • Posts: 14,596
Re: 2023 big year for Fuji?
1

michaeladawson wrote:

Strongly disagree. The camera that doesn’t easily allow me to choose my own ISO is the camera I don’t buy. I usually agree with you Truman, but not here. I’ll use auto-ISO at times when it fits how I’m working. Most of the time, no.

An ISO dial is a thing of the past. The only reason there was one on a camera is because there were different films available with different sensitivities.  The ISO was tied to the film sensitivity in that to get a haven film density, the ISO programmed the light meter so that the appropriate exposure value would be used to render a neutral gray card to that density.

A photo sensor has a fixed sensitivity. One can not change the sensitivity of the photodetectors.  Today if you shoot an XT5, your sensor sensitivity is fixed. That is X amount of light energy will result in Y photons captured by the photodetector. No amount of spinning an ISO dial or wheel will make it anything but Y.

ISO is really meaningless in modern digital cameras. It is little more than an amplification level for the amplifiers between the output of the photodetectors and the ADC.  If one is wanting jpegs with a “standard brightness” out of the camera, then one needs to pay attention to ISO. In fact that is how ISO is defined in the standard - jpeg brightness. For raw ISO is more or less meaningless.

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Truman
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