Lens Mapping
This stage involves mapping the encoder values received from the lens encoders to the real world values that are displayed on the barrel of the lens. Ncam Reality will expect to have encoder mapping done for any lens that is added to the system that has it’s focus, zoom or iris set to dynamic in the Calibration panel.
To map a lens, press the "Map Lens" button in the calibration panel
Before trying to map a lens, make sure the correct encoder choice has been made in preferences. If using a lens control system such as Tilta or Preston, then ensure the device has been correctly configured and that the motors are calibrated
The mapping window will appear, this has tabs for Zoom, Focus, and Iris
The "encoder value" field will display the current encoder value. This should be a number that ranges from 0 to 1. Before proceeding make sure that the full range can be achieved and that:
- When at minimum (close) focus the encoder value reads 0 (or very near to)
- When at maximum (infinity) focus the encoder value reads 1 (or very near to)
- When at minimum (wide) zoom the encoder value reads 0 (or very near to)
- When at maximum (tele) zoom the encoder value reads 1 (or very near to)
If using Ncam External Encoders, it may be necessary to invert the focus or zoom reading. The encoder should read 0 when at close focus or fully wide zoom. To invert the encoder, select the relevant option from the Camera Bar drop down menu, this will require leaving the mapping window temporarily.
To complete the lens mapping, for each value marked on the lens, adjust the lens barrel so that is is in that position, and then enter the respective value into the field in the dialog box. While the lens is still at this point, press the "add" button. This will populate that reading into the table below.
Proceed through the rest of the lens until all markings have been input
When adding the final focus "infinity" value, simply double the previous focus value, alternatively, any sufficiently high number can be used as a substitute