More about the magic.
Due to their size and image quality the BMPCC and BMMCC are widely recognized as great digital cinema camera’s. It’s now possible to get the most out of them by taking away their main weaknesses: moiré and IR contamination.
The RAWLITE IR-cut OLPF incorporates low pass layers that control the prevention of moiré. The original glass of the BMPCC and BMMCC does not have such layers.
The original blue-green glass of the BMPCC and BMMCC has relatively weak IR absorption. This is especially noticeable when using ND filters. The Infra Red light (IR) is not filtered enough and contaminates the image with a non continuous red-brownish tint, that is not completely removable with color correction.
The RAWLITE IR-cut OLPF has stronger IR-absorption and a hot mirror coating: this cuts Infra Red light very effectively.
The red channel is usually the first channel to clip. The IR-cut OLPF protects the red channel channel by almost 2/3 of a stop. This means an increase in effective dynamic range.