The Antlia Dark series R+ filter is designed to allow transmission of wavelengths above 700nm, which covers NIR and IR bands. 

Considering the high quantum efficiency (QE) of modern sensors in the near-infrared bands, this filter pairs with LRGB filters to capture valuable signals that cannot be detected by regular LRGB filter sets. In post-processing, combine the R and R+ channels to create a new R channel. The remaining steps for processing are identical to those used as regular LRGB filters.

The response curve for the R+ filter is shown in this diagram.