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Resolution Chart Comparison

Shots here are of our new '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.

Olympus E-520 (5.5 MB; 10 MP) Sony DSLR-A350 (3.1 MB, 14 MP)
Canon EOS 450D (2.6 MB, 12.2 MP) Pentax K200D (3.8 MB; 10 MP)

Olympus E-520 Sony DSLR-A350
Canon EOS 450D Pentax K200D

Olympus E-520 Sony DSLR-A350
Canon EOS 450D Pentax K200D

Olympus E-520 Sony DSLR-A350
Canon EOS 450D Pentax K200D

Measurable results

Camera Measurement
Absolute
resolution
Extinction
resolution
Olympus E-520 Horizontal LPH * 2050  * 2300 
Vertical LPH * 2050  * 2300 
Sony DSLR-A350 Horizontal LPH 2300  2700 
Vertical LPH 2200  2500 
Canon EOS 450D Horizontal LPH 2300  * 2500 
Vertical LPH 2200  * 2500 
Pentax K200D Horizontal LPH * 1950  * 2200 
Vertical LPH * 2050  * 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 Olympus does well against the other 10 megapixel cameras we've lined it up against, even if it can't keep up with the higher pixel-count bodies it will sit alongside on the shop shelves. It is also noticeably more prone to color moire than the Sony and Canon, which takes away from its otherwise good performance.

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