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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.

Pentax K200D (3.8 MB; 10 MP) Olympus E-520 (5.5 MB; 10 MP)
Canon EOS 450D (2.6 MB, 12.2 MP) Nikon D60 (2.6 MB, 10 MP)

Pentax K200D Olympus E-520
Canon EOS 450D Nikon D60

Pentax K200D Olympus E-520
Canon EOS 450D Nikon D60

Pentax K200D Olympus E-520
Canon EOS 450D Nikon D60

Measurable results

Camera Measurement
Absolute
resolution
Extinction
resolution
Pentax K200D Horizontal LPH * 1950  * 2200 
Vertical LPH * 2050  * 2300 
Olympus E-520 Horizontal LPH * 2050  * 2300 
Vertical LPH * 2050  * 2300 
Canon EOS 450D Horizontal LPH 2300  * 2500 
Vertical LPH 2200  * 2500 
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 Pentax K200D's JPEG resolution is not quite but almost on the same level as the other 10 Mp cameras in this comparison, it trails quite a bit behind the 12.2 MP Canon though. The Pentax image also shows the largest amount of color moire. Most of this can be attributed the the K200D's JPEG engine. As we've demonstrated in previous sections of this review the K200D's output improves significantly when you shoot in RAW.

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