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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.

Sony DSLR-A350 (3.1 MB, 14 MP) Canon EOS 450D (2.6 MB, 12.2 MP)
Pentax K20D (8.5 MB; 14.5 MP) Sony DSLR-A200 (2.4 MB; 10 MP)

Sony DSLR-A350 Canon EOS 450D
Pentax K20D Sony DSLR-A200

Sony DSLR-A350 Canon EOS 450D
Pentax K20D Sony DSLR-A200

Sony DSLR-A350 Canon EOS 450D
Pentax K20D Sony DSLR-A200

Measurable results

Camera Measurement
Absolute
resolution
Extinction
resolution
Sony DSLR-A350 Horizontal LPH 2300  2700 
Vertical LPH 2200  2500 
Canon EOS 450D Horizontal LPH 2300  * 2500 
Vertical LPH 2200  * 2500 
Pentax K20D Horizontal LPH 2250  * 2400 
Vertical LPH 2250  * 2400 
Sony DSLR-A200 Horizontal LPH 2200  * 2700 
Vertical LPH 1950  * 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)

The A350's measurable resolution is certainly impressive. It's on a par with Canon's 450D, which isn't hugely surprising - the moire pattern visible in the 450D's chart suggests it has a slightly weaker Anti-aliasing filter in front of the sensor. Sony has sacrificed a tiny fraction of absolute resolution in order to avoid this effect. It's also worth remembering that the difference between the 450D's 12.2MP and the A350's 14.2MP output is only a 7% increase in resolution in each dimension.

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