D4 Read Noise
Prepared 2012-01-11 by Bill Claff (last revised 2012-03-20)
The D4 Read Noise values were determined from the Optical Black data in NEF files.
Here is a table of measured values (in 14-bit ADUs):
|
ISO |
noise |
Gain |
noise |
|
50 |
2.346 |
7.22 |
16.9 |
|
62 |
2.346 |
7.22 |
16.9 |
|
79 |
2.388 |
7.22 |
17.2 |
|
100 |
2.385 |
7.22 |
17.2 |
|
125 |
2.493 |
5.73 |
14.3 |
|
158 |
2.553 |
4.55 |
11.6 |
|
200 |
2.371 |
3.61 |
8.6 |
|
251 |
2.556 |
2.87 |
7.3 |
|
317 |
2.680 |
2.27 |
6.1 |
|
400 |
2.977 |
1.81 |
5.4 |
|
503 |
3.288 |
1.43 |
4.7 |
|
634 |
3.781 |
1.14 |
4.3 |
|
800 |
4.179 |
0.903 |
3.8 |
|
1007 |
5.064 |
0.716 |
3.6 |
|
1269 |
5.810 |
0.569 |
3.3 |
|
1600 |
7.196 |
0.451 |
3.2 |
|
2015 |
8.438 |
0.358 |
3.0 |
|
2539 |
10.176 |
0.284 |
2.9 |
|
3200 |
12.520 |
0.226 |
2.8 |
|
4031 |
15.394 |
0.179 |
2.8 |
|
5079 |
19.592 |
0.142 |
2.8 |
|
6400 |
21.262 |
0.113 |
2.4 |
|
8063 |
26.574 |
0.09 |
2.4 |
|
10159 |
32.467 |
0.071 |
2.3 |
|
12800 |
40.698 |
0.071 |
2.9 |
|
16126 |
26.829 |
0.071 |
1.9 |
|
20318 |
31.771 |
0.071 |
2.3 |
|
25600 |
39.195 |
0.071 |
2.8 |
|
51200 |
38.654 |
0.071 |
2.7 |
|
102400 |
41.072 |
0.071 |
2.9 |
|
204800 |
41.282 |
0.071 |
2.9 |
Note that all electron figures are subject to change pending a better
measurement of gain.
The following chart shows these values as a function of ISO:
Shown as a log-log chart for clarity.
The open symbols represent ISO values in the “normal” analog gain range while the
closed symbols represent to "Lo" and "Hi" values.