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SFRplus Chart: Inkjet on Paper - 4:1 Contrast Ratio

SFRplus Chart: Inkjet on Paper - 4:1 Contrast Ratio Instructions Operating Manual SFRplus Chart: Inkjet on Paper - 4:1 Contrast Ratio PDF
This SFRplus Chart: Inkjet on Paper - 4:1 Contrast Ratio Instrument are Certified with
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1 Years Warranty (Additional support period of 3 years)
SFRplus options are offered to support a wide range of image testing applications.
Options include:

Contrast Ratios Options

  • 4:1 contrast ratio matches the upcoming new ISO-12233 specs.
  • 10:1 and 2:1 contrast ratios  Use of both contrast levels improves ability to analyze non-linear signal processing, which may not affect the lower contrast 2:1 contrast ratio regions 
  • 10:1 contrast only improves the completeness of 3D maps of performance across the imaging surface. 

Paper Type - Semi-gloss or Matte Options

  • Matte paper can be easier to light because it has less specular reflection than the semi-gloss paper.  The MTF is slightly less than semi-gloss paper and does not have as deep dark tones on the stepchart.
  • Semi-gloss paper has slightly higher detail than matte, has deeper black tones on the stepchart, and is recommended for most applications except for wide-angle lenses.

Square Grid Dimensions Options

  • 5x9 grid dimension is recommended for for typical DSLR formats with aspect ratios of 3:2 and typical HDTV formats with aspect ratios of 16:9.
  • 5x7 grid dimension is recommended for typical compact camera formats with aspect ratios of 4:3.

Ink Jet Chart Resolution

This chart, and all our ink jet printed charts have an approximate MTF50 of 5 cycles/mm.  For a comparison of rflective surfaces, as well as what this means when choosing your chart, please visit our Reflective Surface Comparison Blog. Please keep this in mind when choosing the size of chart.  Using a chart that is too small with a high-resolution sensor can result in the MTF of the chart degrading the measured MTF of the camera system. In addition, it is important to use a chart that is large enough to accomodate the minimum focus distance, as well as the resultion of your sensor. 

Paper Size and Active Area Options

Charts are available in five main sizes with variations depending on the grid dimensions selected. It is recommended that the medium sized charts be used to test imaging systems with sensors up to 12 MP, the large charts be used for testing of sensors above 12 MP and up to approximately 24 MP, and the extra-large charts be used for sensor sizes above 24 MP.

Paper Size (Including Margin)

  Square Dimensions
5x9 5x7
X-Small 8.5" × 15" 8.5" × 10"
Small 14" × 24" 14" × 20"
Medium 24" × 40" 24" × 34"
Large 44" × 60" 44" × 60"
X-Large 44" × 74" 44" × 64"

Active Area

The active area of the chart includes white space above and below the top and bottom distortion bars. It is slightly larger than the printed area, which is bounded by the distortion bars on top and bottom. White space is included in active area because test images of the chart must include this white space in order to enable automated processing in SFRplus software.

  Square Dimensions
5x9 5x7
X-Small 7.85" × 15" 6.75" × 10"
Small 12.5" × 24" 13.5" × 20"
Medium 22" × 39.22" 22" × 33"
Large 33" × 59" 40" × 59"
X-Large 42" × 72" 42" × 59"

Color Chart Options

Inclusion of the color chart enables testing of color accuracy. If the color option is selected, the "focus star" pattern that aides in focusing is replaced by a 20 patch color chart.

Pre-Distortion Options

Pre-distorted charts offer the ability to map the outer edges of a wide angle or fisheye lens using SFRplus.  These distortion levels are available

Level Matrix
No distortion [1 1]
Distort [0.833 1.123]
Distort+ [1.167 1.577]
Ultradistort [1.167 1.982]


We do not recommend using semi-gloss paper for wide angle lenses or pre-distorted charts

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FAQs About  SFRPlus Test Charts

If there is uneven lighting, color shifts, and the light is not as bright as it was before, your lamps might have to be replaced. Recent light boxes used with Pantone, as well as Datacolor LightBooths, have usage timers that tell how long before a lamp needs to be replaced.


For a proper color evaluation, ensure cleanliness, use standardized observation conditions, eliminate stray light, and periodically change the lamps.


Light should be projected through the sample to measure haze, then assess the scattered light with an integrating sphere and sensors.  The haze percentage is ascertained by the scattering light to the total transmitted light.

Pick a haze meter that correlates with your materials, precision needs, and applicable testing protocols. For lab-level precision, a bench-top version is advisable; for a rapid field check, a portable haze meter is appropriate. International standards must be met at all times.


a. It’s needed to perform manual calibration for NH310 when first starting.

b. In the subsequent starting, NH310 will perform auto calibration at startup. No need to perform manual calibration.

c. Suggestion: it’s best to perform manual calibration once a week or when NH310 measured data is not accurate.

A magnetic induction gauge measures galvanized coatings by sensing the zinc coating on steel and iron. The measurement tells how thick the protective coating is. This is done to ensure the prevention of rusting.  


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