Resolution Chart Comparison

Images below are of both versions of our charts, we introduced version two of the resolution chart in October 2005 to cope with the higher resolution cameras which could already out-res the version one chart. The Pentax K100D and Canon EOS 350D images are of this version two chart, the Pentax *ist DS and Nikon D50 images are of version one. The only difference for this comparison is the relative size of the typeface and the fact that the horizontal resolution 'up to 2000 LPH' ramp runs from left to right on the version two chart, right to left on the version one.

Nikon D40 (1,739 KB, 6.1 MP) [V2] Pentax K100D (2,143 KB, 6.1 MP) [V2]
Canon EOS 350D (2,418 KB; 8.2 MP) [V2] Nikon D50 (2,204 KB, 6.1 MP)

Nikon D40 Pentax K100D
Canon EOS 350D Nikon D50

Nikon D40 Pentax K100D
Canon EOS 350D Nikon D50

Measurable findings (three measurements taken for each camera):

Camera Measurement
Nikon D40 Horizontal LPH * 1600  * 1850 
Vertical LPH 1550  1700 
Pentax K100D Horizontal LPH * 1600  * 1800 
Vertical LPH * 1600  * 1800 
Canon EOS 350D Horizontal LPH 1850  2100 
Vertical LPH 1650  2100 
Nikon D50 Horizontal LPH 1600  * 1850 
Vertical LPH 1400  * 1850 

* 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 res. 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 res. Detail beyond camera's definition (becomes aliased)

Interestingly despite its apparent advantage in our still life scene comparison the D40 performed very slightly under the K100D's figures. There can be several explanations for this but the most likely is that Nikon's software based 'low pass filtering' kicks in earlier than that of the K100D which also exhibits more moire at and beyond absolute resolution.