Started Jan 16, 2013 | Discussions thread
Mark H
Mark H Veteran Member • Posts: 3,593
Re: The missing ISO-125 and ISO160...

Steen Bay wrote:

jimr wrote:

On the back of the brochure the X20 Specifications lists the following:

"Sensitivity". AUTO (control available up to ISO 3200) Equivalent to ISO 100/200/250/320/400/500/640/800/1000/1250/1600/2000/2500/3200/4000/5000/6400/12800 (Standard Output Sensitivity)

ISO 125 and ISO 160 are missing, so think it's likely that ISO 100 is an extended ISO.

These particular ISO values are also missing on the X10 etc - so there is no difference in the specifications there.

The X10's missing ISO-125 and ISO-160 has puzzled me for some time.

Certainly, from my examination of the X10's RAW data at ISO-100, there is no evidence of the X10's ISO-100 being an 'extended' value.

Neither does 'DxO's testing find that either - for example, if the X10's ISO-100 was 'extended' then it's dynamic range measurement would be the same at ISO-100 as at ISO-200, but it is clearly better than ISO-200.

Curiously though, 'DxO' reckoned that the X10's ISO-3200 was an 'extended' ISO - but I haven't seen any evidence myself, from looking at RAW data, to support that - and also 'DxO's testing of the X-S1, that uses the same sensor, does not see it's ISO-3200 as an 'extended' value either - which raises some doubts about 'DxO's analysis in my opinion.

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