Hey, @jipilabont, I am Anthony, Occipital’s Customer and Developer Support Specialist.
I can certainly help you get your iPad 6th Generation calibrated while using the Wide Vision Lens.
It seems you are having difficulty locating the checkerboard pattern needed for calibration. You can easily download that here: https://s3.amazonaws.com/io.structure.assets/calibrator-checkerboard.pdf
We recommend that you print that image out and stick it on a wall somewhere where there is ample artificial light. This will help make it easier for you to calibrate, as, sometimes, computer screens can be too glossy for the checkerboard pattern to be easily picked up by the iPad and Structure Sensor.
After you have this checkerboard pattern setup, you can launch the Structure Sensor Calibrator application.
We have created a great tutorial video to teach our customers the correct calibration process. You can take a look at that video here: https://www.youtube.com/watch?v=ihfl7HJYhrk
After you have succesfully calibrate your Structure Sensor with the Wide Vision Lens on, we recommend that you also calibrate your sensor again with the Wide Vision Lens removed.
Hope this information helps!