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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 GF1 (4.3 MB, 12.3 MP) Olympus E-P1 (5.4 MB, 12.3 MP)
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 LX3 (3.4 MB, 10 MP)

Panasonic GF1 Olympus E-P1
Olympus E-620 Canon EOS 500D
Nikon D5000 Panasonic LX3

Panasonic GF1 Olympus E-P1
Olympus E-620 Canon EOS 500D
Nikon D5000 Panasonic LX3

Panasonic GF1 Olympus E-P1
Olympus E-620 Canon EOS 500D
Nikon D5000 Panasonic LX3

Measurable results

Camera Measurement
Absolute
resolution
Extinction
resolution
Panasonic DMC-GF1 Horizontal LPH 2250  2600 
Vertical LPH 2200  2550 
Olympus E-P1 Horizontal LPH 2300  2750 
Vertical LPH 2250  2650 
Nikon D5000 Horizontal LPH 2200  * 2650 
Vertical LPH 2100  *2600 
Canon EOS 500D Horizontal LPH 2350  * 3400 
Vertical LPH 2300  * 2650 
Panasonic LX3 Horiz LPH 2150  2400 
Vert LPH 2150  2500 
Olympus E-620 Horizontal LPH 2200  * 2550 
Vertical LPH 2150  * 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 GF1 produces output that - unsurprisingly - is very similar to the G1 it is based on, and to the Olympus E-P1 (though the latter's better JPEG engine shows the same advantage here as it did in our studio still life tests). Overall the GF1 - even in JPEG mode - compares well to most entry level and mid range SLRs at a similar price point.

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