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Resolution Chart Comparison

Shots here are of our standard resolution chart (version one or two). This 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. (Note that on version two of our chart the vertical resolution 1000 - 2000 lines have been horizontally flipped but are otherwise identical). 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 +0.7 EV to +1.3 EV.

Olympus E-330 (4,083 KB; 7.4 MP) Canon EOS 350D (2,537 KB; 8 MP)
Olympus E-500 (4,958 KB; 8 MP) Sony DSC-R1 (3,739 KB; 10 MP)

Olympus E-330 Canon EOS 350D
Olympus E-500 Sony DSC-R1

Olympus E-330 Canon EOS 350D
Olympus E-500 Sony DSC-R1


Measurable findings (three measurements taken for each camera):

Camera Measurement
Absolute
resolution
Extinction
resolution
Olympus E-330 Horiz LPH * 1700  * 2000 
Vert LPH * 1600  * 2000 
Canon EOS 350D Horiz LPH 1850  + 2000 
Vert LPH 1650  + 2000 
Olympus E-500 Horiz LPH * 1800  * 1950 
Vert LPH * 1650  * 1950 
Sony DSC-R1 Horiz LPH * 1950  * 2400 
Vert LPH * 1700  * 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)
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, slightly lower resolution than its eight megapixel sibling the E-500 but really not enough to make a significant difference to anyone. Notable however is the amount of moire visible (just like the E-500) from around 1600 LPH onwards. Olympus really need to upgrade their image processing engine to deliver crisper images with less sharpening artifacts and better 'false color removal' (moire removal).

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