A7RM3 DxOMark Derived Results Added to PhotonsToPhotos

Started 2 weeks ago | Discussions thread
OP bclaff Veteran Member • Posts: 5,709
Re: A7RM3 DxOMark Derived Results Added to PhotonsToPhotos
9

So here are some details on why I think the DxOMark measurements for the A7RM2 are off.

Remember that the DxOMark Landscape score comes directly from read noise measurements.

Here are the Read Noise in DNs for the A7RM2 and A7RM3 at PhotonsToPhotos:

Dual conversion gain at ISO 640 is quite obvious.
And these read noise values are precise enough to show the slight improvement the A7RM3 has over the A7RM2 below ISO 400.

Here is the Read Noise in DNs from the DxOMark data for the A7RM3:

Open circles are the DxOMark values

I added a red line to show how read noise drops between ISO 400 and ISO 800; as it should.

Now, here is the Read Noise in DNs from the DxOMark data for the A7RM2:

Open circles are the DxOMark values

I added a red line to show how read noise does not drop between ISO 400 and ISO 800; this is wrong.

So, for whatever reason, DxOMark data for the A7RM2 was not accurate.
This led to a lower Landscape score than it should have had.
Making the good A7RM3 data look better relative to the A7RM2 than it ought.

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Bill ( Your trusted source for independent sensor data at PhotonsToPhotos )

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