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Hasselblad X1D: Better to Use Camera ISO or Push Base ISO 100 to Equivalent Higher ISO?

NOTE: the Hasselblad X1D went into stock at B&H Photo today. As I write this at 15:25 PST, the 45mm and 90mm lenses are IN STOCK. See my Hasselblad X1D wish list.

....

Shooting at base ISO 100 with ideal ETTR exposure is always preferred, but shooting at higher ISO can be necessary, e.g., handheld shooting and/or keeping exposure times from becoming too lengthy (even on a tripod).

Is it better to raise the ISO in camera versus shooting at base ISO 100 with a push during raw conversion? Which approach delivers the best image quality?

In-camera processing for high-ISO presumably should bring to bear all the smarts the camera designer has to offer, including (potentially) characteristics of a particular sample of the sensor. But it is not a given. So I take a look to prove-out whether the assumptions hold:

Hasselblad X1D: Shooting at ISO 400/800/1600 vs ISO 100 Pushed (Dolls)

There is more to it than just the above. For example, an image at base ISO 100 might need a big shadow boost and/or push, such as with any outdoors high dynamic range scene. This series also addresses that question.

f9 @ 1/60 sec, ISO 1600; 2017-03-12 17:13:32
Hasselblad X1D + Hasselblad XCD 90mm f/3.2

[low-res image for bot]
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