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.

Panasonic GH1 (4.3MB, 12.0 MP) Canon EOS 500D (4.4MB, 15.1 MP)
Nikon D5000 (3.5 MB; 12.3 MP) Olympus E-620 (6.4 MB, 12.3 MP)

Panasonic GH1 Canon EOS 500D
Nikon D5000 Olympus E-620

Panasonic GH1 Canon EOS 500D
Nikon D5000 Olympus E-620

Panasonic GH1 Canon EOS 500D
Nikon D5000 Olympus E-620

Measurable results

Camera Measurement
Panasonic GH1 Horizontal LPH 2300  2900 
Vertical LPH 2300  2900 
Canon EOS 500D Horizontal LPH 2350  * 3400 
Vertical LPH 2300  * 2650 
Nikon D5000 Horizontal LPH 2200  * 2650 
Vertical LPH 2100  * 2600 
Olympus E-620 Horizontal LPH 2200  * 2550 
Vertical LPH 2150  * 2550 

* Moire 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 GH1's performance in the resolution comparison is in the the same ballpark as entry level DSLRs such as the Canon EOS 500D or Nikon D5000. It produces a measurably higher resolution than the other Four Thirds camera in this test, the Olympus E-620. The Panasonic's output is also pleasantly clean and artifact-free.