D700 Read Noise
Prepared 2011-12-17 by Bill Claff

 

The D700 Read Noise values were determined from the Optical Black data in NEF files.

Here is a table of measured values (in ADUs):

ISO

noise
ADU

gain
e-/ADU

noise
e-

100

3.959

3.852

15.251

125

3.988

3.852

15.365

158

3.956

3.852

15.241

200

3.985

3.852

15.351

251

4.956

3.058

15.153

317

6.292

2.427

15.269

400

4.422

1.926

8.518

503

5.615

1.529

8.584

634

7.062

1.213

8.569

800

5.896

0.963

5.679

1007

7.548

0.764

5.769

1269

9.210

0.607

5.588

1600

12.296

0.482

5.921

2015

15.075

0.382

5.762

2539

18.643

0.303

5.655

3200

23.765

0.241

5.722

4031

30.348

0.191

5.799

5079

37.813

0.152

5.735

6400

48.506

0.120

5.839

8063

30.205

0.120

3.636

10159

38.100

0.120

4.587

12800

48.646

0.120

5.856

25600

48.948

0.120

5.892


The following chart shows these values as a function of ISO:


Shown as a log-log chart for clarity.

The open symbols represent the numbered ISO values while the closed symbols represent to "Lo" and "Hi" values.
 
The stepped nature of the open symbols implies a two stage amplification process.