Calibrate A Test Lens

Calibrate a Test Lens

Click Here for AF Information for Canon 7D Service Software and later releases! Older software compensates for lens discrepancies by creating a custom 3D target while later softwares create a compensation data file to achieve that same.



Click here for TipsPicking A Test Lens


Points to Ponder:

  • Soft lenses lack a definitive point of focus.
  • Play in the focus threads will cause inconsistent focusing.  It can also broaden / soften the depth of focus.
  • The recommended lens is a 50mm F/1.8.
  • The recommended target distance is 1 meter / 3 feet.
  • SPT software allows to you calibrate more then one test lens.  You can shorten the distance to limit depth-of-focus.



Steps in Calibrating a Test Lens:

Click Here for AF Information including Calibrating a Test Lens  for Canon 7D Service Software and later releases!

Step 1


Step 2

  • 'Click' Enable Sensors.  Lock in one sensor to limit variations.


Step 3

  • 'Click' Take a Test Picture.  Take a series of test pictures using several bodies.  Use the Focus Tool and Bell Graph to measure the point of focus.   Average the differences to determine your lens deviation in millimeters.


Step 4

  • Error.  Use this window to type in the averaged lens deviation.


Step 5

  • Lens Name.  Use this window to name the lens you are using, serial numbers work best.  The name prints on the Compensated 3D chart so you can match the lens to the chart.


Step 6


To view Autofocus functions click on their Tabs Below:


Link to 7D and later Software Window



Print Standard 3D Graph
Prints standard 3D target

Take a Test Picture
The camera takes a test picture through imaging software.

Print Compensated 3D Graph
Prints your test lens compensated 3D target




Lens Name
Type in the Lens Identification tag to be printed on the compensated 3D target

Error (mm)
Type in the lens deviation in millimeters and tenths of a millimeter

Prints the compensated 3D target with a macro focus box.

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