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 +0.7 EV to +1.3 EV (depending on the camera).

Pentax K10D (2,271 KB; 10 MP)	Nikon D80 (2,769 KB; 10 MP)
Sony Alpha DSLR-A100 (2,213 KB; 10 MP)	Canon EOS 30D (2,409 KB; 8.2 MP)

Pentax K10D	Nikon D80
Sony Alpha DSLR-A100	Canon EOS 30D (8 MP)

Pentax K10D	Nikon D80
Sony Alpha DSLR-A100	Canon EOS 30D (8 MP)

Pentax K10D	Nikon D80
Sony Alpha DSLR-A100	Canon EOS 30D (8 MP)

Measurable findings (three measurements taken for each camera):

Not that surprising to see the K10D under performing in our resolution chart shot, this due primarily to the already discussed lack of sharpness in edge detail (be this due to poor demosaicing or unusual sharpening). Overall the biggest difference (versus the competition) is in the horizontal direction. A RAW converted resolution chart exhibits about 2200 LPH in the horizontal direction and 2000 LPH in the vertical direction.