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.

Pentax K100D (2,143 KB, 6.1 MP) [V2] Canon EOS 350D (2,418 KB; 8.2 MP) [V2]
Pentax *ist DS (2,083 KB, 6.1 MP) Nikon D50 (2,204 KB, 6.1 MP)

Pentax K100D Canon EOS 350D
Pentax *ist DS Nikon D50

Pentax K100D Canon EOS 350D
Pentax *ist DS Nikon D50

Measurable findings (three measurements taken for each camera):

Camera Measurement
Pentax K100D Horizontal LPH * 1600  * 1800 
Vertical LPH * 1600  * 1800 
Canon EOS 350D Horizontal LPH 1850  2100 
Vertical LPH 1650  2100 
Pentax *ist DS Horizontal LPH * 1400  * 1550 
Vertical LPH * 1400  * 1600 
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)

As we expected a better performance than the *ist DS, but surprisingly also better than the Nikon D50. A performance which brings the K100D (and K110D for that matter) to the top of the six megapixel pile (at least for resolution).