The extended low ISO is almost always going to lose one stop of DR. I
would only use it if you need it for exposure control and an ND filter
is not available or practical.
Base ISO varies on the sensor and sensor design. Most of the sensors
now have around ISO 200 for base ISO. In reality, it's probably
anywhere from ISO 100 to 400, but the engineers and marketing
department have tuned it to 200. Ten years ago, the bulk of the
sensors were at ISO 100 for base ISO. Again, give or take a healthy
smidge.
AG (invariant) Schnozz
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