What am I doing wrong? (color noise Sigma SD Quattro @ ISO 100)

Started 3 months ago | Questions thread
brendanpaxton
brendanpaxton Forum Member • Posts: 54
Re: good bokeh means comprises elsewhere..

xpatUSA wrote:

brendanpaxton wrote:

What is the base ISO of the Sigma SDQH?

100, Brendan. Sigma uses the ISO Recommended Exposure Index method these days which means it would be hard to measure by your good self.

That corroborates my test. There is a definitive loss of highlight detail at higher ISOs on the SDQH when maintaining light exposure (aperture and shutter speed).

Scene shot at ISO 100 and ISO 320 with comparisons:

SDQH ISO 100, 0 exp bias, 0 exp edit (SPP raw X3F edit)

SDQH ISO 320, +1.7 exp bias, -1.7 exp edit (SPP raw X3F edit)

With comparisons:

Definitive loss of highlight detail at higher ISO with equivalent exposure time

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