NiSi IR ND uses H-K9L high quality optical glass, with double-sided nano-coating, to reduce the intensity of visible light entering the lens, It will not change the brightness contrast of the scene, and also provides effective inhibition of ultraviolet and infrared light. The Nano Coating technology of NiSi IR ND has been innovated by NiSi Filters. Please visit NiSi IRND page to get more tech information.
Kinefinity provides two practical bundles:
- Core Bundle (Three pieces): 0.3/0.6/1.2. You can also choose any three pieces of glass including different f-stops even polarizer, the same size;
- Professional Bundle (Six pieces): 0.3/0.6/0.9/1.2/1.5/1.8. You can also choose any six pieces of glass including different f-stops even polarizer, the same size.
Please make note for the type of your ND if what you choose is not default.
The following is a comparison video by Radiant Images. It uses same one RED Dragon 6K + UP, but with different IRND. One is NiSi ND filter, the other is Tiffen IRND. There is no grading on the clips too.
ND filter is short for neutral density filter. It’s a filter that can reduce and modify the intensity of all wavelengths or colour of light equally. The function of the this filter is to reduce the visible light at equal proportion, and won’t change the brightness and colour contrast of the scene. IR ND is based on the common ND filter of adding resistance to infrared light function, IR is short for “Infrared Ray”.
Basically, ND filters have three sizes:
- 4×4″: minimum size of external cinema ND filter: requires diameter of lens is less than 100mm;
- 4×5.65″: most popular cinema ND filter: requires diameter of lens is less than 100mm;
- 6×6″: suits for 19mm system. For cine lens with larger 110mm diameter, it needs 6×6″.
Most external ND filters are placed on matte box, so please confirm the supporting system of your matte box is for 15mm or 19mm. If 19mm, it needs 6×6″ sized ND filters.
Besides, the number of Cinema ND filters respond to reduction f-stops:
- 0.3 means 1 f-stop;
- 0.6 means 2 f-stop;
- 0.9 means 3 f-stop;
- 1.2 means 4 f-stop;
- 1.5 means 5 f-stop;
- 1.8 means 6 f-stop;
- 2.1 means 7 f-stop.
ND filters can be overlaped to get more combination of reduction. The calculation is linear in f-stops.