Nikon D40X Review: 26. Compared to...: Digital Photography Review

Resolution Chart Comparison

Shots here are of our new '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.

Nikon D40X (2,762 KB, 10 MP)	Canon EOS 400D (2,720 KB, 10 MP)


Olympus E-410 (5,530 KB; 10 MP)	Nikon D40 (1,739 KB, 6 MP)

Nikon D40X	Canon EOS 400D


Olympus E-410	Nikon D40 (6 MP)

Nikon D40X	Canon EOS 400D


Olympus E-410	Nikon D40 (6 MP)

Nikon D40X	Canon EOS 400D


Olympus E-410	Nikon D40 (6 MP)

Measurable results

Camera	Measurement	Absolute resolution	Extinction resolution
Nikon D40X	Horizontal LPH	2200	2300
Nikon D40X	Vertical LPH	1800	2300
Canon EOS 400D	Horizontal LPH	2200	2300
Canon EOS 400D	Vertical LPH	1800	2300
Olympus E-410	Horizontal LPH	* 2050	* 2300
Olympus E-410	Vertical LPH	* 1800	* 2300
Nikon D40	Horizontal LPH	* 1600	* 1850
Nikon D40	Vertical LPH	1550	1700

*	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)

As expected the D40X delivers the exact same resolution as its more expensive 'prosumer' model the D80, indeed the resolution chart crops look virtually identical to that camera. This 2200/1800 LPH result also in line with the Canon EOS 400D and Sony Alpha DSLR-A100.

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