On Sharpness, ISO and Shutter Speed

Started Nov 29, 2013 | Discussions thread
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Jack Hogan OP Veteran Member • Posts: 5,390
Re: On Sharpness, ISO and Shutter Speed

rubank wrote:

Thanks for this.

Your analysis makes it clear that the studio tests must be taken with some grains of salt.

BTW, the sometimes much critisized IR test shots doesn´t show the same variations, AFAICT.
I´ve downloaded a vast number of IR's RAW files during the years and for more cameras than I can remember, but I haven´t seen this kind of difference between exposures (ISO's). Differences in focussing between cameras is a wellknown fact, but that is something else.

Imho IR is not a good source for this type of information: they admit that they do not have time to meet Imatest's focusing standards, so they do not focus peak properly.  The few images of theirs that I have tested (e.g. D800) confirm this.

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