Olympus Camedia C-50 Zoom Review
Compared to... (contd.)
Here we will use our standard color and resolution charts to compare C-50 Zoom to the Pentax Optio 550, Canon PowerShot S50 and Nikon Coolpix 5000.
Colour Chart Comparison
Colour charts are shot in daylight, Auto White Balance, EV compensation +0.3 (all cameras), measured light ~10 EV. This test is also dependent on the accuracy of the camera's auto white balance, the colour charts are shot in daylight but some camera's white balance is better than others. All cameras are given 20 seconds to "settle" before the shot is taken.
|Olympus C-50 Zoom||Pentax Optio 550|
|Canon PowerShot S50||Nikon Coolpix 5000|
In the table below we're only measuring colour. The RGB values were measured from a VGA reduced image (to average colors, remove noise and eliminate JPEG artifacts) using the Eyedropper tool in Photoshop with a 5 by 5 Average Sample Size.
The C-50 Zoom's white balance did seem to consistently produce a cooler (more blue) white balance than the other cameras. This can be seen by the high value of the blue channel above (most noticeable in the black, gray and white patches). The C-50 Zoom's color balance is probably closest to Canon's PowerShot S50.
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. So a value of 8 equates to 800 lines per picture height.
Studio light, cameras set to auto, all settings factory default. Exposure compensation +0.7 EV for all cameras (to compensate for the white background). Click on the camera name below the crops to download the full resolution chart (large JPEG's).
|Horizontal resolution||Vertical resolution||5 degree diagonal res.|
|Olympus C-50 Zoom (2,152 KB)|
|Pentax Optio 550 (2,254 KB)|
|Canon PowerShot S50 (2,011 KB)|
|Nikon Coolpix 5000 (1,609 KB)|
Measurable findings (three measurements taken for each camera)
|Camera||Measurement||Absolute Res.||Extinction Res.|
|Olympus C-50 Zoom||Horizontal LPH||* 1425||* 1650|
|Vertical LPH||* 1300||* 1650|
|5° Diagonal LPH||+ 1000||n/a|
|Pentax Optio 550||Horizontal LPH||1350||1500|
|5° Diagonal LPH||+ 1000||n/a|
|Canon PowerShot S50||Horizontal LPH||1425||1650|
|5° Diagonal LPH||# + 1000||n/a|
|Nikon Coolpix 5000||Horizontal LPH||* 1350||* 1500|
|Vertical LPH||* 1200||1500|
|5° Diagonal LPH||+ 1000||n/a|
* Moiré is visible, + Chart maximum, # Jagged diagonals
Definition of terms
|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 Resolution||Still defined detail (below Nyquist frequency*)|
|Extinction Resolution||Detail beyond camera's definition (becomes a solid gray alias)|
|n/a||Not Available (above the capability of the test chart)|
|n/v||Not Visible (not visible on test results)|
image detail. Beyond the Nyquist frequency aliasing occurs.
The C-50 Zoom surprised us in the resolution test because here it produced as much resolution as the Canon PowerShot S50 and more than the Pentax Optio 550. This surprise due to its performance on the previous page, our side-by-side comparison. We can only conclude that the C-50 Zoom lost some of its ability to resolve detail in that test because of increased image noise. Overall the C-50 Zoom produced higher resolution than we would expect from a compact five megapixel digital camera (although it's worth noting the moiré at the limit).
|Prague by Manuel Jos Carvajal|
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|DONALD SPRAYING STEAM by TX Photo Doc|
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