Previous page Next page

Resolution Chart Comparison

Shots here are of the PIMA/ISO 12233 standard resolution test chart (more of which are available in our comparison database). This resolution chart allows us to measure the actual performance of the lens and sensor system. It measures the ability of the camera to resolve lines at gradually higher resolutions and enables us to provide a definitive value for comparison purposes. Values on the chart are 1/100th lines per picture height. So a value of 15 equates to 1500 lines per picture height. For each camera the relevant 50 mm prime lens was used. The chart is shot at a full range of apertures and the sharpest image selected.

Studio light, cameras set to auto, all settings factory default. Aperture selected for optimum sharpness. Exposure compensation +0.7 EV to +1.3 EV.

Nikon D50 (2,204 KB; 6 MP) Nikon D70s (2,357 KB; 6 MP)
Canon EOS 300D (2,241 KB; 6 MP) Pentax *ist DS (2,083 KB; 6 MP)

Nikon D50 Nikon D70s
Canon EOS 300D Pentax *ist DS

Nikon D50 Nikon D70s
Canon EOS 300D Pentax *ist DS

Nikon D50 Nikon D70s
Canon EOS 300D Pentax *ist DS

Nikon D50 Nikon D70s
Canon EOS 300D Pentax *ist DS

Measurable findings (three measurements taken for each camera):

Camera Measurement
Absolute
resolution
Extinction
resolution
Nikon D50 Horiz LPH 1600  * 1850 
Vert LPH 1400  * 1850 
Nikon D70s Horiz LPH 1600  * 1850 
Vert LPH 1450  * 1850 
Canon EOS 300D Horiz LPH 1600  1900 
Vert LPH 1450  1850 
Pentax *ist DS Horiz LPH * 1400  * 1550 
Vert LPH * 1400  * 1600 

* Moire is visible
+ Chart maximum
LPH Lines per Picture Height (to allow for different aspect ratios the measurement is the same for horizontal and vertical)
5° Diagonal Lines set at 5° diagonal
Absolute res. Point at which all lines of a resolution bar are still visible and defined, beyond this resolution loss of detail occurs (below Nyquist frequency).
Extinction res. Detail beyond camera's definition (becomes aliased)
n/a Not Available (above the capability of the test chart)
n/v Not Visible (not visible on test results)

As we had expected the D50 delivers virtually the same resolution as the D70/D70s, perhaps just a little bit less vertically. The biggest difference is what happens as we get into frequencies above nyquist, the maze / moire response on the D50 is noticeably less than / different to that of the D70s.

Previous page Next page
160
I own it
2
I want it
201
I had it
Discuss in the forums

Comments