SFRplus Chart: Inkjet on Paper - 10:1 & 2:1 Contrast Ratio-3NH

Contrast Ratio Options

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.
4:1 contrast ratio matches the upcoming new ISO-12233 specs. Click here for our 4:1 contrast ratio SFRplus test charts

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 Dimension 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. 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 tfive 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 Option

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 (5x7)	Matrix (5x9)
No distortion	[0 0]	[0 0]
Distort	[0.833 1.123]	[0.833 1.375]
Distort+	[1.167 1.577]	[1.167 1.982]
Ultradistort	[1.333 2.313]	[1.333 2.958]

1. Do you Offer OEM and ODM Spectrophotometer Service?

Yes. We can supply OEM and make customized design for any specific application. Our MOQ for OEM and ODM service is 5 pcs for one model. We can not only offer standard machines, but also customized machines. Don’t hesitate to tell us your requirement, we will try our best to meet your needs.

2. How accurate are Threenh Colorimeters?

The repeatability is an important parameter for the accuracy of the colorimeter. Threenh Technology portable colorimeter for color measurements tandard deviation ΔE*ab is within 0.03 (Measurement condition: the average value of 30 measurements on the white board at an interval of 3s after calibration). Each colorimeter can pass the qualified inspection before leaving the factory to ensure it conforms to the standard of China Metrology Institute.

5. Does the colorimeter provide a formula for color matching?

Threenh Technology colorimeters provide a color deviation prompt function according to the Lab value, which can provide a reference for color matching. The handheld colorimeter can only indicate blacker, whiter, redder, greener, yellower or bluer, but it cannot provide accurate color formulas. Only with the help of a spectrophotometer and professional color matching software can fully realized automated color matching.