Resolution Chart Comparison
Comparison cameras:
- Canon PowerShot A640 (10MP, 4x zoom)
- Canon PowerShot A620 (7MP, 4x zoom)
- Panasonic DMC-LX2 (10MP, 4x zoom)
- Canon PowerShot G7 (10MP, 6x zoom)
- Panasonic DMC-FZ50 (10 MP, 12 x zoom)
- Fujifilm FinePix S9500 / S9000 (9MP, 10.7x 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). 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 auto, settings all factory default. If possible aperture was selected for optimum sharpness. Exposure compensation +0.3 EV to +1.3 EV.
Resolution chart crops
Measurable findings
| Camera |
Measurement |
Absolute
resolution |
Extinction
resolution |
| Canon PowerShot A640 |
Horiz LPH |
1775 |
2250 |
| Vert LPH |
1850 |
* 2400 |
| 5° Diagonal LPH |
+1000 |
n/a |
| Canon PowerShot A620 |
Horizontal LPH |
1550 |
1950 |
| Vertical LPH |
1600 |
* 2100 |
| 5° Diagonal LPH |
+ 1000 |
n/a |
| Panasonic DMC-LX2 |
Horiz LPH |
1600 |
2050* |
| Vert LPH |
1700 |
2100* |
| 5° Diagonal LPH |
+ 1000 |
n/a |
| Canon PowerShot G7 |
Horiz LPH |
1775 |
2225* |
| Vert LPH |
1850 |
2350* |
| 5° Diagonal LPH |
+ 1000 |
n/a |
| Fujifilm FinePix S9000 |
Horiz LPH |
1900 |
2500 |
| Vert LPH |
1850 |
2400 |
| 5° Diagonal LPH |
+1000 |
n/a |
| Panasonic DMC-FZ50 |
Horizontal LPH |
1850 |
2400 |
| Vertical LPH |
1800 |
2300 |
| 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) |
As mentioned in the G7 review, the A640 is well able to keep up with its pricier stable mate, and resolution is on a par with the other 10MP cameras on the market. Unsurprisingly the additional 3 million pixels give the A640 a resolution boost (in the region of 15%) over its predecessor and the results are fairly clean (not over-sharpened) until you start to approach extinction resolution when a little moiré is visible. |
Please wait, fetching latest prices.
Digg
del.icio.us
Reddit
Google
