Compared to the Nikon D1x (contd.)
ISO Sensitivity / Noise levels
 As
with the previous noise comparison between the EOS-D30 and D60 we simply
shoot a colour patch chart (a GretagMacBeth ColorChecker) at the full
range of ISO sensitivities. These set of tests were carried out in normal
light levels (10.6 EV).
Each of the comparison crops below are made up of a 90 x 80 crop of
patches 19, 22 and 24 of the ColorChcker chart (as indicated above). This
helps to give a better impression of noise at different light levels within
an image. Directly below this you will find the average standard deviation
of these three patches, this is a quantifiable measurement of noise.
Test Notes
- Measurements were taken at normal room temperature of 21°C (~70°F),
you should expect noise to reduce in lower temperatures and increase
in higher temperatures.
- Performance comparison carried out in RAW mode to remove the effects
of JPEG artifacts skewing the higher ISO results. RAW images were converted
to 8-bit TIFF's using Canon RAW Image Converter v2.0 (default settings)
and Nikon Capture 2.0 (default settings).
- Camera settings were defaulted before tests carried out (thus default
parameters, sharpening etc.). The visibility of noise will be reduced
by decreasing sharpening.
- The 'standard deviation' was measured using the histogram feature
in Photoshop on 8-bit TIFF or JPEG files (later comparison). Lower figures
mean there is less 'deviation' from the average luminance level, and
thus less noise.
- The D1x's lowest sensitivity is ISO 125, so bear this in mind when
looking at the first crop. The D1x's highest normal sensitivity is ISO
800 although it can be boosted to ISO 1600 or 3200 via a custom function.
Performance of Nikon D1x vs. EOS-D60 vs. in normal light
| Camera |
Nikon D1x |
Canon EOS-D60 |
| Sensitivity |
ISO 125 |
ISO 100 |
| Exposure |
1/13 s, F9.0 |
1/10, F9.0 |
Patch crops
ISO 125 / 100
RAW |
 |
| Standard dev. avg. |
1.21 |
0.64 |
| |
|
|
| Camera |
Nikon D1x |
Canon EOS-D60 |
| Sensitivity |
ISO 200 |
ISO 200 |
| Exposure |
1/20 s, F9.0 |
1/20, F9.0 |
Patch crops
ISO 200
RAW |
 |
| Standard dev. avg. |
1.40 |
0.94 |
| |
|
|
| Camera |
Nikon D1x |
Canon EOS-D60 |
| Sensitivity |
ISO 400 |
ISO 400 |
| Exposure |
1/40 s, F9.0 |
1/40, F9.0 |
Patch crops
ISO 400
RAW |
 |
| Standard dev. avg. |
1.97 |
1.37 |
| |
|
|
| Camera |
Nikon D1x |
Canon EOS-D60 |
| Sensitivity |
ISO 800 |
ISO 800 |
| Exposure |
1/80 s, F9.0 |
1/80, F9.0 |
Patch crops
ISO 800
RAW |
 |
| Standard dev. avg. |
3.00 |
2.30 |
As you can clearly see Canon's CMOS sensor technology appears work very
well at keeping noise levels low. Looking at the graph below you can see
that the two noise curves are almost identical in shape (they're both
roughly exponential) but that the D60 always has an approximately 30%
lower standard deviation average.
|
