A reminder for some memebers as to what the F stop is all about.

Started Jan 26, 2014 | Discussions thread
bobn2 Forum Pro • Posts: 62,183
Re: Agreed!

Great Bustard wrote:

Then there is the case where you are shooting at base ISO on your 35mm sensor already - and there is no "two stops less noisy" ISO 25 setting on the small sensor. Then the small sensor can offer no match for the larger sensor, no matter what the origial poster seems to be claiming.

I think the reason they don't have ISO 25 is because the lower ISO setting would result in more noisy pixels and would adversely hurt higher ISO performance.

This is purely a marketing issue - the ISO equivalence is two stops lower in any case. They could also use the Aptina DR-Pix switchable pixel (like the Nikon 1 series), which could give 25ISO base without the read noise penalty.

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