|
There isn't a huge difference between Red and IR. Technically, red starts are ~550nm and ends at 850nm. IR kicks in at 700nm onward so there is an overlap window of 150nm (based on UBVRI filters). My guess is that its happening across the entire spectrum, not just red filtered data. In any case, yes, UV/IR blocking is recommended... if not mandatory for RGB as the IR signal poisons the data making it difficult to balance the colour correctly.
|