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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.

Canon EOS 30D (2,409 KB; 8.2 MP) Nikon D200 (2,728 KB; 10.0 MP)
Canon EOS 5D (3,552 KB; 12.8 MP) Canon EOS 20D (2,415 KB; 8.2 MP)

Canon EOS 30D Nikon D200
Canon EOS 5D Canon EOS 20D

Canon EOS 30D Nikon D200
Canon EOS 5D Canon EOS 20D

Canon EOS 30D Nikon D200
Canon EOS 5D Canon EOS 20D

Measurable findings (three measurements taken for each camera):

Camera Measurement
Absolute
resolution
Extinction
resolution
Canon EOS 30D Horizontal LPH 1850  2100 
Vertical LPH 1650  2100 
Nikon D200 Horizontal LPH 2100  2250 
Vertical LPH 1700  2200 
Canon EOS 5D Horizontal LPH 2300  2500 
Vertical LPH 2000  2500 
Canon EOS 20D Horizontal LPH 1850  2100 
Vertical LPH 1650  2100 

* 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)
5° Diagonal Lines set at 5° diagonal
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)
n/a Not Available (above the capability of the test chart)
n/v Not Visible (not visible on test results)

No surprises, the same sensor, the same image processor and we get exactly the same results, the same absolute and extinction resolution and even the same 'type' of moire effect. As we noted previously the jump from eight to ten megapixels doesn't account for a huge leap of resolution, eight to (almost) thirteen does.

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Comments

RVer
By RVer (4 months ago)

The 30D had a 50 mm lens and the 5D had an 85mm lens and that could account for the difference in reading the globe etc.

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