Last Modified: December 3, 2014
When connected to a compatible lens controller, the “Lens” Panel will automatically update.
You set your lens tracker by selecting the proper “Lens Source” in your “Trackers” panel, under Tracking tab.
To manually try different focal lengths, you can set your Lens Tracker to “Manual” (or “None” in older Previzion versions). This enables sliders and user input on the Lens Panel for manually adjusting
The main lens values Previzion uses are:
- Focal Length (mm)
- Field of View (deg) – Derived from Focal Length and Sensor Width
- Focus Distance (cm)
- Entry Pupil (cm) – Often termed the “nodal point” of the lens
- Center Offset X & Y – Distance from the center of the sensor to the optical axis. A measure of lens misalignment in mm.)
- Distortion R2 – The first order radial distortion of the lens)
- Iris (fstop)
Setting Iris and Depth-of-Field
Setting the Iris value to that of the physical lens will hold the best result for realistic depth between virtual and physical.
This setting is the never set by the lens controller. It is always set manually. In other words, even if the lens controller has encoders or encoded motor for Iris, Previzion does not listen to this input.
For fine-tuning depth of field use the Depth of Field Scale parameter in:
Scene tab -> Scene Effects -> Depth Of Field Scale
You can keep the scale to:
- 1.0 to preserve a true depth of field that is input into the Iris (F-Stop) field,
- values between 0.00 and 1.00 for more depth-of-field,
- 0.00 for turning depth of field “off” (infinite depth-of-field), where everything is in focus or
- values above 1.0 to exaggerate the effect, narrowing the depth-of-field.