Resolution Chart Comparison (JPEG)

Shots here are of our '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. 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 aperture priority (optimum aperture selected), image parameters default. Exposure compensation set to deliver approximately 80% luminance of white area.

Olympus E-620 (6.4 MB, 12.3 MP) Canon EOS 500D (4.4MB, 15.1 MP)
Nikon D5000 (3.5 MB; 12.3 MP) Panasonic DMC-G1 (2.6 MB, 10.1 MP)

Olympus E-620 Canon EOS 500D
Nikon D5000 Panasonic DMC-G1

Olympus E-620 Canon EOS 500D
Nikon D5000 Panasonic DMC-G1

Olympus E-620 Canon EOS 500D
Nikon D5000 Panasonic DMC-G1

Measurable results

Camera Measurement
Absolute
resolution
Extinction
resolution
Olympus E-620 Horizontal LPH 2200  * 2550 
Vertical LPH 2150  * 2550 
Nikon D5000 Horizontal LPH 2200  * 2650 
Vertical LPH 2100  *2600 
Canon EOS 500D Horizontal LPH 2350  * 3400 
Vertical LPH 2300  * 2650 
Panasonic DMC-G1 Horizontal LPH 2350  2700 
Vertical LPH 2300  2550 

* 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)
Absolute resolution 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 resolution Detail beyond camera's definition (becomes aliased)

The E-620's does a good job of eking out all the detail its sensor can capture - as we'll see on the next page, unlike the other cameras here, there's little resolution advantage to shooting RAW. It does a good job of staying competitive with the other cameras here, which is something that recent E-System Olympus cameras have struggled with.