Resolution Chart Comparison

Comparison cameras:

  • Canon Powershot A570 IS (7MP, 4x zoom)
  • Canon PowerShot A710 IS (7MP, 6x zoom)
  • Samsung NV7 OPS (7MP, 7x zoom)
  • Casio Exilim (7MP, 7x zoom)

Shots here are of our standard resolution chart (version one or two). This 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. So a value of 15 equates to 1500 lines per picture height. (Note that on version two of our chart the vertical resolution 1000 - 2000 lines have been horizontally flipped but are otherwise identical).

Studio light, cameras set to auto, settings all factory default. If possible aperture was selected for optimum sharpness. Exposure compensation +0.3 EV to +1.3 EV.

Canon Powershot A570 IS (2,486 KB; 7 MP) Canon PowerShot A710IS (2,426 KB; 7 MP)
Samsung NV7 OPS (1,728 KB; 7 MP) Casio Exilim EX-V7
(2,701 KB; 7 MP)

Resolution chart crops

Canon Powershot A570 IS Canon PowerShot A710 IS
Samsung NV7 OPS Casio Exilim EX-V7
Canon Powershot A570 IS Canon PowerShot A710 IS
Samsung NV7 OPS Casio Exilim EX-V7

Measurable findings

Camera Measurement
Canon A570 IS Horiz LPH * 1550 * 2000
Vert LPH 1500 * 2000
5° Diagonal LPH #1000 n/a
Canon PowerShot A710IS Horizontal LPH 1500 1800
Vertical LPH 1550 * 1950
5° Diagonal LPH + 1000 n/a 
Samsung NV7 OPS Horiz LPH * 1450 * 2000
Vert LPH 1500 * 1900
5° Diagonal LPH +1000 n/a
Casio Exilim EX-V7 Horiz LPH 1400 1550*
Vert LPH 1375 1550*
5° Diagonal LPH + 1000 n/a 

* Moiré is visible
# Jagged diagonals
+ 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 A570 IS's resolution isn't bad at all and up there with the best in the 7MP compact class. Although not the sharpest we've ever seen, the test chart is fairly clean with only some mild moire artefacts and some jagged lines as you approach higher frequencies.