Description
The NiSi 4×5.65″ Blue-Streak Filter 1mm adds an elongated blue flare to spherical lenses. It reproduces the streak look that anamorphic glass creates naturally. The filter drops straight into a standard 4×5.65″ matte box tray. As a result, a production can get that signature streak look without swapping out an entire lens set.
How the streak effect is created
NiSi builds the filter from clear, optical-grade H-K9L glass. A single series of fine lines runs 1mm apart across its surface. These lines catch point light sources, strong highlights, and reflective or metallic surfaces. They then stretch that light into a horizontal blue streak. Because the etching is so fine, the rest of the frame stays clean and sharp.
Getting a straight, anamorphic-style flare
NiSi recommends focal lengths of 35mm and longer for this filter. Shorter, wider lenses can introduce distortion. That distortion bends the streak instead of keeping it straight. So, a crew chasing a clean anamorphic look should stick to the longer end of their set. The filter also rotates freely in the tray. As a result, its orientation can be dialed in to match a shot — horizontal, vertical, or angled.
On-set use
This filter works on ordinary spherical lenses. So it is a fast way to add a stylised flare during a shoot day. There is no need for the cost or weight of full anamorphic glass. The effect suits several production types:
- Music videos
- Commercials
- Narrative scenes built around practical lights, neon signage, or car headlights
In each case, a controlled streak adds production value in-camera rather than in the grade.
