NiSi NISI-P1-ND0.9 P1 Holder 3-Stop Glass Filter

The NiSi NISI-P1-ND0.9 is a 3-stop neutral density glass filter built specifically for the NiSi P1 filter holder system. It reduces the amount of light entering the lens by three stops (ND0.9), allowing photographers to use slower shutter speeds or wider apertures in bright conditions. This is particularly valuable for mobile photographers and compact camera users who want to capture long-exposure effects — such as silky water or streaked clouds — without overexposing the image. The filter is constructed from high-quality optical glass rather than resin, which helps maintain sharpness and clarity across the frame.

What sets this filter apart from basic ND options is the double-sided, multi-layer Nano coating applied to the glass. This coating serves multiple purposes: it makes the surface hydrophobic so water beads off easily, it resists oil from fingerprints, and it provides a degree of scratch resistance that extends the filter's usable life. NiSi also emphasizes ultra-low color cast, meaning the filter should not introduce noticeable warming or cooling to your images — a common issue with lower-quality ND filters that can require tedious white balance correction in post. For photographers working within the NiSi P1 ecosystem, this filter is a practical and well-built accessory for expanding creative control over exposure.