General discussion

Camera Dynamic Range

Submitted by Roger Breton on

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I asked Nikon Tech Support to tell me what the Dynamic Range for my D810 is but they declined to "disclose" this information.

In DPreview, they say "13EV at ISO 64" according to this link :
https://www.dpreview.com/reviews/nikon-d810/15

My question, is there any way to relate the bit range of a camera to its 'Dynamic Range", mathematically?
Like, my NIkon D810 has a 14bit range.

Uncompressed RAW of Nikon Z7II smaller than D850

Submitted by EricBowles on

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The Nikon D850 and the Z7II both have the same sized sensor - and supposedly different versions of the same sensor. In comparing Uncompressed 14 bit RAW files from the two cameras, the Z7II file is roughly 13% smaller - averaging 84 MB compared to 97 MB for the D850 image. The pixel dimensions of both cameras are the same. I've verified I am selecting the correct settings in the camera, but that does not mean Uncompressed files are the same. File size for 8-10 sample images varied less than 0.5%. I tested with a range of ISO settings including base ISO 64 for both cameras.

On the definition of EV0 - Part 4

Submitted by Roger Breton on

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Had the chance to shoot my ColorChecker 24 chart using a Manual Exposure mode.

I used Spot reading on patch N5. The result is here :
https://1drv.ms/b/s!AkD78CVR1NBqlsJM1NJMBouJhQPcdg?e=CaNJID

There is a screen capture of the RawDigger main window.
There is a Histogram of the entire image.

Then I made a Selection of only the bottow row.
I made a separate screen capture.

On the definition of EVO - Part 3

Submitted by Roger Breton on

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In this experiment, I took at picture of an old photographic Kodak Gray Scale target with my Nikon D810.
I metered the exposure manually on patch M, which is closest to an 18% reflectance middle gray.

Here is RawDigger main window (with the cursor sitting on the M patch) :
https://1drv.ms/u/s!AkD78CVR1NBqlsJIwpfjVPljvOJC3Q?e=EYUrs4

On the definition of EV0 -- Part 2

Submitted by Roger Breton on

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(For some reason, I could not reply to my own post... So I created this "new post")

This is a long awaited follow-up to my original question.
In order to "progress", conceptually, with RawDigger, I felt I had to go back to basic photography concepts.

So I first purchased a ColorChecker GrayBalance 4"x7" target from X-Rite, having "18% reflectance" which I tested to be approximately the case.
(I can provide spectral measurements if interested)

On the definition of EV0

Submitted by Roger Breton on

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Still new to RawDigger and most of the concepts herein...
One of the striking features to me in the Histograms is the presence of an "EV scale".
I understand that EV stands for "Exposure Value", a legacy photographic term and related to scene Luminance.
What strikes me most is this "EV=0" reference?
Page 26 of 85 in the User Guide has a section of the "EV grid" where it is explained that "EV0" is automatically calculated from the image statistics: "Located at 3 stops lower than the maximum pixel value, rounded to the nearest power of 2".

Help with understanding Raw data statistics per channel

Submitted by guitarman67 on

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Hi all. This is my first post since buying RawDigger. Could someone please explain to me in very basic language what the numbers mean in the statistics per channel box (see 2) and their relation to the over/under exposed stats (see 6). I'm finding this really confusing. Thanks so much. Paul.

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