E-M5 Firmware update... V 2.0 today..

Started 9 months ago | Discussions thread
Thomas Niemann
Veteran MemberPosts: 4,094
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Re: Exactly
In reply to texinwien, 9 months ago

texinwien wrote:

Iliah Borg wrote:

The dpreview of the E-M1 indicated that there was less highlight detail at ISO 100. Their graphs also indicate this. (scroll down to the end of this page).

It is from processed images, not from the raw data. To decide how the midtone placed in the raw one needs to operate directly on the raw data, without any tone curves that a converter applies. The difference between ISO 100 and ISO 200 settings is just the placing of the midtone - 1 stop higher for ISO 100. Means the headroom in highlights for ISO 100 is 1 stop less. You can easily determine the exact number yourself by shooting some evenly lit surface out of focus while allowing the exposure meter to set the exposure; and looking at the placement of the histogram peak in raw data

And as we know from tests performed by DXOMark and others, the E-M5's base sensor saturation ISO is ~107, which means that ISO LOW on this camera is likely to be a camera ISO of ~100 with a saturation ISO of ~100 and no (significant) loss of RAW DR.

I see two statements and am having difficulty reconciling the two.

"the headroom in highlights for ISO 100 is 1 stop less"

"no (significant) loss of RAW DR"

Can someone help me out here?

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