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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.

Pentax K20D (8.5 MB; 14.5 MP) Sony DSLR-A700 (2.6 MB, 12.2 MP)
Olympus E-3 (4.7 MB; 10 MP) Canon EOS 450D (2.6 MB, 12.2 MP)

Pentax K20D Sony DSLR A700
Olympus E-3 Canon EOS 450D

Pentax K20D Sony DSLR A700
Olympus E-3 Canon EOS 450D

Pentax K20D Sony DSLR A700
Olympus E-3 Canon EOS 450D

Measurable results

Camera Measurement
Absolute
resolution
Extinction
resolution
Pentax K20D Horizontal LPH 2250  * 2400 
Vertical LPH 2250  * 2400 
Sony DSLR-A700 Horizontal LPH * 2200  2900 
Vertical LPH 2100  2800 
Olympus E-3 Horizontal LPH 2100  * 2400 
Vertical LPH * 1800  2200 
Canon EOS 450D Horizontal LPH 2300  * 2500 
Vertical LPH 2200  * 2500 

* 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)

 

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