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Nikon D750 with Sigma 50mm F1.4 DG HSM Calibration Test Information



Test Information

Property Description
Data Creation FoCal Version
Data Analysis FoCal Version 2.6.5M
OS Version OS X 10.13.6
Source Mode Camera Mode
Image Capture Mode JPEG
Analysis Method Multi-ESH (RGB)
Camera Model D750
Firmware Version V1.12
Serial Number 8547706
Shutter count (start) 95
Test Colour Temp 5200K
Lens Sigma 50mm F1.4 DG HSM | A
Focal Length 50mm
Termination Reason Success
Test Aperture f/1.4
Test ISO 400
Defocus Method Large defocus away from the camera
Distance to Target 3.2m to 3.3m
Starting AF Fine Tune 0
Tested AF Fine Tune Range Full (-20 to 20)
AF Fine Tune Step Size Auto
AF Consistency Constraint 6%
Total Shot Count 16
Calculated AF Fine Tune -9
Result Confidence Excellent
Consistency of Focus 99.1%


Lens Profile Chart

The Lens Profile chart shows how the image quality changes as the AF Microadjustment changes. The orange line represents how the sharpness is expected to change through all values, so the highest point on this line corresponds to the best predicted AF Microadjustment value.


Each point on the chart represents the result of a single shot:


  • Red marker: unoptimised sharpness
  • Green marker: optimised sharpness
  • Orange circle within marker - this is the representative sharpness for this AFMA
  • Orange curve - the predicted sharpness across the AFMA range
  • Green triangle - highest value
  • Red triangle - lowest value


Before/After Comparison

The images show the before and after shots.

  AF Fine Tune
Before 0
After -9