The Astronomik Type II filters have an integral IR-Blocking coating, thereby removing the need to have a separate permanently-mounted filter.
The standard set comprises R,G,B and a standard IR-Blocker. For full-spectrum imaging you can use a True Technology clear glass filter (no IR-Block) or an IR-Transmission filter, as this part of the spectrum is not blocked as would be the case with a permanently mounted IR-Blocker.
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