Lumolab K-x - falklumo
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Lumolab noise test chart for Pentax K-x at 2900°K and ISO 100 (extended).

This photo was underexposed by 5 stops! (like 1/500s rather than 1/15s) In order to make the resulting (almost black) photo visible within an 8-Bit file format as allowed by SmugMug, I pushed exposure +5EV before saving as JPG. The result is seen above and theoretically, corresponds to ISO 3200.

This image is an important testimony photo because it is providing proof of the high dynamic range.

It looks like the ISO 6400 sample photo which is fine. Because the K-x applies raw file noise reduction for ISO 3200 and higher gaining 1 stop. So, we have to compare with ISO 6400 because the dark patches in ISO 100 shouldn't have raw file noise reduction applied.

Lumolab noise test chart for Pentax K-x at 2900°K and ISO 100 (extended).

This photo was underexposed by 5 stops! (like 1/500s rather than 1/15s) In order to make the resulting (almost black) photo visible within an 8-Bit file format as allowed by SmugMug, I pushed exposure +5EV before saving as JPG. The result is seen above and theoretically, corresponds to ISO 3200.

This image is an important testimony photo because it is providing proof of the high dynamic range.

It looks like the ISO 6400 sample photo which is fine. Because the K-x applies raw file noise reduction for ISO 3200 and higher gaining 1 stop. So, we have to compare with ISO 6400 because the dark patches in ISO 100 shouldn't have raw file noise reduction applied.