The calibration information shows how well calibrated this lens is likely to be new, out of the box. A higher score (close to 100) indicates that you are less likely to need to calibrate the lens. The score takes into account the likely amount of calibration required, the variation in calibration across many lenses as well as the likely improvement between an uncalibrated and calibrated lens. For zoom lenses, we also use parfocality, which is a measure of the difference in calibration required between each end of the zoom range.
Summary
The summary information shows the metrics measured to build the score.
400mm
Typical Focus Adjustment Magnitude
6.7 units
Focus Adjustment Variation
11.5 units
Adjusted Focus Quality Improvement
2.9%
Requiring No Adjustment
16.7%
Requiring Visually Significant Adjustment (4 or more units)
50.0%
Focus Adjustment Profile
The curve is the composite quality levels across all copies of this lens.
400mm
Typical Focus Adjustment Value
-0.9 units
Adjusted Focus Quality Improvement
2.9%
Focus Adjustment Value Distribution
The bar height indicates the percentage of camera/lens combinations that resulted in the specified focus adjustment value.
400mm
Focus Adjustment Variation
11.5 units
Requiring No Adjustment
16.7%
Requiring Minimal Adjustment (no more than 1 unit)
Requiring Visually Significant Adjustment (4 or more units)
50.0%
Focus Adjustment Magnitude Distribution
The bar height indicates the percentage of camera/lens combinations that resulted in the specified Focus Adjustment Magnitude. This is the size of the focus adjustment needed to calibrate the lens, ignoring the direction.
400mm
Typical Focus Adjustment Magnitude
6.7 units
Focus Score
400mm
The focus information shows how consistent and accurate the focus is for this lens, measured across all camera bodies.
Summary
The summary information shows the metrics measured to build the score.
400mm
Calibrated Focus Error
1.6 units
Focus Consistency
The gauge(s) below show the average amount of error from perfect focus for this lens across all camera bodies. The value is expressed as focus adjustment units (i.e. AF Microadjustment units for Canon cameras, AF Fine Tune units for Nikon, Sony etc). The lower the value, the better the focus repeatability on this lens.
400mm
Focus Shift
The focus shift information shows how the point of best focus changes across the aperture range.
Wide Performance Score
400mm
The wide information shows the performance of the lens when wide open. The measurements are comparisons with the values at the aperture of best image quality, and include measurements of quality, astigmatism and colour-specific quality.
Summary
The summary information shows the metrics measured to build the score.
400mm
Aperture Stops (Wide to Peak)
5.0
Wide Quality Change (vs best IQ)
-22.8%
Astigmatism (wide)
8.8%
Wide Astigmatism Change (vs best IQ)
+9.9%
Red Quality (wide)
100.2%
Wide Red Quality Change (vs best IQ)
+6.0%
Blue Quality (wide)
70.8%
Wide Blue Quality Change (vs best IQ)
-17.3%
Aperture Sharpness Profile
400mm
Wide Quality Change (vs best IQ)
-22.8%
Astigmatism
400mm
Astigmatism (wide)
8.8%
Astigmatism (at best IQ)
2.4%
Wide Astigmatism Change (vs best IQ)
+9.9%
Red/Blue Quality
400mm
Red Quality (wide)
100.2%
Red Quality (at best IQ)
94.3%
Wide Red Quality Change (vs best IQ)
+6.0%
400mm
Blue Quality (wide)
70.8%
Blue Quality (at best IQ)
86.8%
Wide Blue Quality Change (vs best IQ)
-17.3%
Peak Performance Score
400mm
The peak information shows the performance of the lens at the aperture of best image quality.
Summary
The summary information shows the metrics measured to build the score.
400mm
Aperture Stops (Wide to Peak)
5.0
High Quality Apertures (to f/8)
0 of 4 (0%)
Astigmatism (at best IQ)
2.4%
Red Quality (at best IQ)
94.3%
Blue Quality (at best IQ)
86.8%
Peak Histo
400mm
Peak Aperture Range
f/10.3 to f/32.9
Typical Peak Aperture
f/32
Aperture Sharpness Profile
400mm
Aperture at Peak Quality
f/22
Peak Ouality Variation
10.4%
High Quality Apertures (to f/8)
0 of 4 (0%)
Astigmatism
400mm
Astigmatism (at best IQ)
2.4%
Red/Blue Quality
400mm
Red Quality (at best IQ)
94.3%
400mm
Blue Quality (at best IQ)
86.8%
Vignetting Score
400mm
The vignetting information shows how the light is attenuated in the corners of the frame across the aperture range.
Summary
The summary information shows the metrics measured to build the score.
Full Frame
400mm
Vignetting
-0.5 EV
Affected Stop Count
1.9
APS C
400mm
Vignetting
-0.2 EV
Affected Stop Count
1.0
Corner Brightness Profile
Aberration Score
400mm
The aberrations information shows details of the astigmatism and colour quality changes across the aperture and focus range.
Aberration Score
400mm
Summary
The summary information shows the metrics measured to build the score.
400mm
Wide Aperture
f/5.6
Aperture at Peak Quality
f/22
400mm
Astigmatism (at best IQ)
2.4%
Astigmatism (wide)
8.8%
Wide Astigmatism Change (vs best IQ)
+9.9%
Median Astigmatism
7.8%
400mm
Red Quality (at best IQ)
94.3%
Red Quality (wide)
100.2%
Wide Red Quality Change (vs best IQ)
+6.0%
Median Red Quality
89.7%
400mm
Blue Quality (at best IQ)
86.8%
Blue Quality (wide)
70.8%
Wide Blue Quality Change (vs best IQ)
-17.3%
Median Blue Quality
97.9%
Quality
400mm
Wide Aperture
f/5.6
Aperture at Peak Quality
f/22
Astigmatism
400mm
Astigmatism (wide)
8.8%
400mm
Astigmatism (at best IQ)
2.4%
Astigmatism (wide)
8.8%
Wide Astigmatism Change (vs best IQ)
+9.9%
Median Astigmatism
7.8%
Red
400mm
Red Quality (wide)
100.2%
400mm
Red Quality (at best IQ)
94.3%
Red Quality (wide)
100.2%
Wide Red Quality Change (vs best IQ)
+6.0%
Median Red Quality
89.7%
Blue
400mm
Blue Quality (wide)
70.8%
400mm
Blue Quality (at best IQ)
86.8%
Blue Quality (wide)
70.8%
Wide Blue Quality Change (vs best IQ)
-17.3%
Median Blue Quality
97.9%
Prduction Quality Score
400mm
The physical quality information combines consistency and quality metrics to indicate the overall physical (electrical, mechanical and optical) quality and consistency of the lens.
Summary
The summary information shows the metrics measured to build the score.
400mm
Typical Focus Adjustment Magnitude
6.7 units
Requiring Visually Significant Adjustment (4 or more units)
50.0%
Focus Adjustment Variation
11.5 units
Calibration Quality Variation
19.0%
Peak Ouality Variation
10.4%
Aperture Change Image Motion
6.2 μm
Focus Change Image Motion
14.0 μm
Focus Adjustment Profile
400mm
Calibration Quality Variation
19.0%
Focus Adjustment Magnitude Distribution
400mm
Typical Focus Adjustment Magnitude
6.7 units
Focus Adjustment Variation
11.5 units
Aperture Sharpness Profile
400mm
Peak Ouality Variation
10.4%
Image Motion
400mm
Focus Change Image Motion
14.0 μm
400mm
Aperture Change Image Motion
6.2 μm
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