EXCERPT page containing first few paragraphs. 2020-07-14 16:14:09
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This page looks at whether pseudo-ISO 50 offers any value on the Fujifilm GFX-100 versus ISO 100 by analyzing identical exposure times at ISO 50 and ISO 100. It also shows how using ISO can mislead about the camera exposure warning and histogram display.
Pseudo ISO 50
Many cameras have pseudo ISO values, often designated as "L-50" for pseudo ISO 50. Of those, most record exactly the same thing at this low pseudo others vs the first real ISO. This is the way the Fujifilm GFX-100 operates (and its 50 megapixel siblings). Thus there is no advantage to using ISO 50 in terms of recorded exposure.
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