Consequently a shim is needed to correct back focus. The Rawlite OLPF is thicker than the original filter. The Rawlite UM Pro 4.6K OLPF works flawlessly together with the internal ND’s. An anti reflective coating prevents unwanted reflections. The Rawlite UM Pro 4.6K OLPF is specifically designed for the URSA Mini Pro 4.6K, preventing moiré while preserving detail.Ī hot mirror coating is added to cut Infra Red.
After removing it these same screws can be used for installing the precisely fitting Rawlite OLPF. The filter is held in place by three screws. The original IR absorption filter of the URSA Mini Pro 4.6K does not have an OLPF.īlackmagic made it easy to replace it’s IR-absorption filter for an Optical Low Pass Filter (OLPF). To prevent it from occurring most digital cinema camera’s (including the Arri Alexa) have a built in Optical Low Pass Filter (OLPF). Optical Low Pass Filter (OLPF) for Blackmagic URSA Mini Pro 4.6KĪliasing and moiré are common issues with digital imaging.
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