Target Distance Tool: AutoFocus Calibration


You can use the Target Distance Tool to suggest a suitable target distance for AFMA / Focus Fine Tune lens calibration with Reikan FoCal.

Note: this functionality is now part of FoCal, scroll down to read about the new feature!

Choose camera, lens focal length and target size:

Camera
Lens Focal Length
Target Size

Results:

 

Target Distance Tool Now in FoCal


Starting from FoCal 2.5 the target distance tool is now part of FoCal software.

Auto focus calibration distance


Users can select a focal length by selecting “Specify focal length” and moving the slider:

AF target calibration distance


When a camera is connected to FoCal the top option is selected by default and FoCal reads the lens information automatically. With zoom lenses both ‘ends’ of the zoom will provide a distance (see also calibrating zoom lenses):

focus calibration zoom distance


Choose between Feet and Inches or metric via Preferences > Tests:

focus calibration feet and inches

 

More Information

The document What’s the correct distance to run tests at? contains further useful information and explains why target distance is important and why the distance used does not need to be precisely measured in most cases.