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Resolution Chart Comparison (RAW)

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.

For a (more) level playing field we also convert our resolution tests using Adobe Camera RAW. Because Adobe Camera RAW applies different levels of sharpening to different cameras (this confirmed) we had to use the following workflow for these conversions:

  • Load RAW file into Adobe Camera RAW (Auto mode disabled)
  • Set Sharpness to 0 (all other settings default)
  • Open file to Photoshop
  • Apply a Unsharp mask: 80%, Radius 1.0, Threshold 0
  • Save as a TIFF (for cropping) and as a JPEG quality 11 for download
Ricoh GXR/A12 50mm (3.9 MB, 12.3 MP) Leica X1 (4.3 MB; 12 MP)
Canon G11 (1.6 MB, 10MP) Panasonic GF1 (4.3 MB, 12.3 MP)

Ricoh GXR/A12 50mm Leica X1
Canon G11 Panasonic GF1

Ricoh GXR/A12 50mm Leica X1
Canon G11 Panasonic GF1

Ricoh GXR/A12 50mm Leica X1
Canon G11 Panasonic GF1

Measurable results

Camera Measurement
Absolute
resolution
Extinction
resolution
Ricoh GXR/A12 50mm Horizontal LPH 2250  * 2850 
Vertical LPH 2200  * 2800 
Leica X1 Horizontal LPH 2300  * 3200 
Vertical LPH 2300  * 2900 
Canon G11 Horizontal LPH 1950  * 2250 
Vertical LPH 2000  2450 
Panasonic GF1 Horizontal LPH 2450  3500 
Vertical LPH 2400  3400 

* Moiré 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)

Despite of a reduction in perceived sharpness compared to the JPEG files the ACR conversion squeezes a small amount of additional measured resolution out of the Ricoh images. However, the increase is much smaller than on its peers. As we've mentioned in the RAW comparison of the studio shots other RAW converters (including ACR at default settings) can achieve better results on the GXR. See the RAW page of this review for details.

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