Kodak DCS Pro SLR/c Review: 24. Compared to...: Digital Photography Review

Resolution Chart Comparison

Shots here are of the PIMA/ISO 12233 standard resolution test chart (more of which are available in our comparison database). This resolution chart allows us to measure the actual performance of the lens and sensor system. Studio light (continuous), cameras set to auto, all settings factory default. Aperture selected for optimum sharpness. Exposure compensation +0.7 EV to +1.3 EV.

Beyond our chart, but not beyond our means

The standard PIMA/ISO resolution chart is capable of measuring the resolution of standard Bayer sensor digital cameras up to approximately ten megapixels, beyond that we must be a little more creative. To compare the resolution of the SLR/c and EOS-1Ds we shoot the resolution chart from twice the normal distance and end up with a chart exactly half it's normal size (2250 x 1500 for the SLR/c, 2032 x 1352 for the EOS-1Ds). This allows us to measure resolution up to 4000 LPH. When reading the crops below values on the chart now represent 1/200 lines per picture height. So a value of 15 equates to 3000 lines per picture height. It's worth noting that the EOS-1Ds resolution chart was shot with a sharpening setting of 0 (factory default).


Kodak DCS Pro SLR/c (2250 x 1500 cropped, 654 KB)	Canon EOS-1Ds (2032 x 1352 cropped, 482 KB)

Crops from half-size chart

Important: the crops below are taken from a standard resolution chart shot from twice the standard distance, hence measured resolution is double that indicated (10= 2000 LPH).

Kodak DSC Pro SLR/c

Canon EOS-1Ds


Kodak DSC Pro SLR/c	Canon EOS-1Ds

Kodak DSC Pro SLR/c	Canon EOS-1Ds

Kodak DSC Pro SLR/c	Canon EOS-1Ds

Measurable findings (three measurements taken for each camera):

Camera	Measurement	Absolute Res.	Extinction Res.
Kodak DCS Pro SLR/c	Horiz LPH	2400	* 2700
	Vert LPH	2200	* 2700
	5° Diagonal LPH	2000	n/a
Canon EOS-1Ds	Horiz LPH	2400	* 2600
	Vert LPH	2000	* 2600
	5° Diagonal LPH	2000	n/a
Canon EOS-10D	Horiz LPH	1600	1900
	Vert LPH	1450	1850
	5° Diagonal LPH	1000	n/a
Fujifilm S2 Pro (12 mp size)	Horiz LPH	1800	2000
	Vert LPH	1700	2000
	5° Diagonal LPH	1000	n/a

* Moiré is visible, + Chart maximum, # Jagged diagonals

Definition of terms:

LPH	Lines per Picture Height (to allow for different aspect ratios the measurement is the same for horizontal and vertical)
5° Diagonal	Lines set at 5° diagonal
Absolute Resolution	Still defined detail (below Nyquist frequency*)
Extinction Resolution	Detail beyond camera's definition (becomes a solid gray alias)
n/a	Not Available (above the capability of the test chart)
n/v	Not Visible (not visible on test results)

* Nyquist frequency defined as the highest spatial frequency where the sensor can
still faithfully record image detail. Beyond the Nyquist frequency aliasing occurs

The SLR/c puts in a slightly lower resolution performance than the 14n, this could be explained by the redesigned sensor and absorption filter used. Horizontal resolution is virtually the same as the EOS-1Ds, vertical resolution is slightly higher but in both cases the SLR/c exhibits strong color moiré at extinction.

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