Resolution Chart Comparison

Shots here are of our 'version two' resolution chart which provides for measurement of resolution up to 4000 LPH (Lines Per Picture Height). A value of 20 equates to 2000 lines per picture height. For each camera the relevant prime lens was used. The chart is shot at a full range of apertures and the sharpest image selected. Studio light, cameras set to aperture priority (optimum aperture selected), image parameters default. Exposure compensation set to deliver approximately 80% luminance of white area.

Sony DSLR-A200 (2.4 MB, 10.2 MP) Canon EOS 1000D (2.2 MB, 10.1 MP)
Olympus E-420 (4.8 MB; 10 MP) Nikon D60 (2.6 MB, 10 MP)

Sony DSLR-A200 Canon EOS 1000D
Olympus E-420 Nikon D60

Sony DSLR-A200 Canon EOS 1000D
Olympus E-420 Nikon D60

Sony DSLR-A200 Canon EOS 1000D
Olympus E-420 Nikon D60

Measurable results

Camera Measurement
Sony DSLR-A200 Horizontal LPH * 2200  * 2750 
Vertical LPH * 1950  * 2500 
Canon EOS 1000D Horizontal LPH * 2150  * 2450 
Vertical LPH 1950  2150 
Olympus E-420 Horizontal LPH * 2050  * 2350 
Vertical LPH * 1850  * 2300 
Nikon D60 Horizontal LPH 2200  2300 
Vertical LPH 1800  2300 

* 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)
Absolute resolution 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 resolution Detail beyond camera's definition (becomes aliased)

The A200's measured resolution is quite remarkable for a 10MP sensor and up there with the best in class. The camera's output is very clean and also preserves 'some' detail up to very high resolutions (although there is also a hint of color moire appearing at higher resolutions). In this comparison the Sony's measured resolution can only be matched by the D60 although the Nikon's output is not quite as clean as the A200's. There is a little more moire visible in the Canon 1000D's image which suggests it might use a weaker AA filter then the other cameras.