ISO Invariance, why not?

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tspear Regular Member • Posts: 139
ISO Invariance, why not?
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I still run across a number of posts here where people discuss using higher ISO settings.

Considering the chips in most Sony mirrorless cameras is dam close to ISO Invariant; you actually lose more data adjusting the ISO away from the neutral set point(s). Depending on the chip, the ones I have researched have either a single point, others (such as my Sony A7RIV have two points neutral points: 100 and 320.

All other ISO values are a digital signal attenuation to effectively reduce the dynamic range produce a "lighter" or "darker" image.

What am I missing?

Tim (the clueless hobbyist)

 tspear's gear list:tspear's gear list
Sony a7R IV Sigma 35mm F1.4 DG HSM Art Sony FE 200-600 F5.6-6.3 Tamron 70-180mm F2.8 Di III VXD +1 more
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