The Firecrest Ultra/Pro Joel Tjintjelaar Signature Edition 100mm Long Exposure Kit #1 from Formatt Hitech is for shorter exposures in the 30 second to 1 minute range.
The versatile kit features 100x100mm IRND 0.9, 1.8, and 3.0 filters, a 100mm Firecrest MKII filter holder, and an 86mm ultra-slim circular polarizer. It also includes 86-86mm and 86-82mm rotating adapter rings, 86-77mm and 86-72mm standard adapter rings, and a multi pouch.