Resolution Chart Comparison
Comparison cameras:
- Canon PowerShot G7 (10MP, 6x zoom)
- Canon PowerShot A640 (10MP, 4x zoom)
- Panasonic DMC-LX2 (10MP, 4x zoom)
- Canon PowerShot G6 (7MP, 4x 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 G7 |
Horiz LPH |
1775 |
2225* |
| Vert LPH |
1850 |
2350* |
| 5° Diagonal LPH |
+ 1000 |
n/a |
| Canon PowerShot A640 |
Horiz LPH |
1775 |
2250 |
| Vert LPH |
1850 |
* 2400 |
| 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 G6 |
Horizontal LPH |
1600 |
* 1800 |
| Vertical LPH |
1650 |
+* 1900 |
| 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) |
Unsurprisingly the G7 offers roughly the same resolution as the other high quality 10MP cameras we've tested,with fairly clean results and a smooth fall off as you approach extinction frequency (although there is a bit of moiré, common to most Canon compacts). At best it manages to squeeze maybe 10 per cent more detail out of the scene than predecessor the G6. Interestingly the output from the G7 and it's far less pricey stable mate, the A640, is pretty much identical (in fact if anything the A640 actually manages a fractionally higher resolution). |
Digg
del.icio.us
Reddit
Google
Please wait, fetching latest prices.