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.

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) Canon EOS 450D (2.6 MB, 12.2 MP)

Canon EOS 500D Nikon D5000
Olympus E-620 Canon EOS 450D

Canon EOS 500D Nikon D5000
Olympus E-620 Canon EOS 450D

Canon EOS 500D Nikon D5000
Olympus E-620 Canon EOS 450D

Measurable results

Camera Measurement
Canon EOS 500D Horizontal LPH 2350  * 2800 
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 
Canon EOS 450D Horizontal LPH 2300  * 2500 
Vertical LPH 2200  * 2500 

* 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 results of this resolution test are in line with what we've seen on the previous studio scene comparison pages: the EOS 500D's nominal advantage in resolution (i.e. megapixels) over its predecessor only results in a very marginal increase of measured resolution. The JPEG output of both the Nikon and Olympus can't quite match the Canons in this test. All cameras show at least mild signs of moire.