Resolution Chart Comparison

Comparison cameras:

  • Canon PowerShot A620 (7 MP, 4x zoom)
  • Olympus SP-310 (7 MP, 3x zoom)
  • Nikon Coolpix 7900 (7 MP, 3x zoom)
  • Casio EX-Z750 (7 MP, 3x zoom)

Shots here are of the PIMA/ISO 12233 standard resolution test chart (more of which are available in our comparison database). This resolution 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. Thus a value of 15 equates to 1500 lines per picture height.

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Note: The SP-310 and A620 shots shown 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.

Studio light, cameras set to auto, settings all factory default. If possible aperture was selected for optimum sharpness. Exposure compensation +0.7 EV to +1.3 EV.

Canon PowerShot A620 (4,630 KB; 7 MP) Nikon Coolpix 7900 (2,348 KB; 7 MP)
Olympus SP-310 (4,630 KB; 7 MP) Casio EX-Z750 (3,991 KB; 7 MP)

Resolution Chart crops

Canon PowerShot A620 Nikon Coolpix 7900
Olympus SP-310 Casio EX-Z750
Canon PowerShot A620 Nikon Coolpix 7900
Olympus SP-310 Casio EX-Z750

Measurable findings

Camera Measurement
Canon PowerShot A620 Horizontal LPH 1550 1950
Vertical LPH 1600 * 2100
5° Diagonal LPH + 1000 n/a 
Olympus SP-310 Horizontal LPH 1550 * 1800
Vertical LPH 1550 *1800
5° Diagonal LPH + 1000 n/a 
Nikon Coolpix 7900 Horizontal LPH 1500 1750
Vertical LPH 1500 1750
5° Diagonal LPH + 1000 n/a 
Casio EX-Z750 Horizontal LPH 1650 +* 2000
Vertical LPH 1600 *1900
5° Diagonal LPH + 1000 n/a 

* Moiré 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)

The A620 is up with the best of the current crop of 7MP compacts, and the results are very clean. In truth there's very little difference between any of these cameras in resolution terms - certainly not enough to be visible in a print.