Controlling the movement of water and clouds – the magic of ND filters

Controlling the motion of water and clouds – the magic of ND filters

Long exposure has fascinated photographers and filmmakers for years. Thanks to it, the movement of water turns into a soft, painterly structure, and clouds begin to “flow” across the sky, giving frames dynamism and character. The key to achieving such effects are ND filters, which allow you to consciously control the amount of light and work creatively even in full sunlight. In this article, we present what Irix ND filters are used for, how screw-in filters differ from magnetic ones in the Irix MMS system, and how to choose a solution suited to photography or filmmaking.

ND filters – how to use long exposure in photography and film

If you have ever looked at photos where water looks like milky mist and clouds flow across the sky as if brushed with a paintbrush, it is very likely that ND filters were responsible for that effect. This is one of those accessories that not only expands creative possibilities but actually changes the way you think about landscape photography and filmmaking. Irix ND filters are designed specifically for working in difficult lighting conditions and wherever full control over exposure is crucial. An ND filter works in a simple but brilliant way – it reduces the amount of light entering the lens without changing the colors of the scene. Thanks to this, we can significantly extend exposure time even in the middle of the day. This is where the real fun with long exposure begins. The movement of water in seas, rivers, or waterfalls turns into smooth, plastic forms, and moving clouds add an extra effect that cannot be achieved without ND filters. In street photography, an ND filter allows people to “disappear” from the frame, and in film it makes it possible to maintain natural motion blur in bright light and with an open aperture.

Screw-in ND filters – a universal tool for photographers

In the Irix lineup, we find classic screw-in ND filters, which are a universal and intuitive solution to use. They are mounted directly onto the lens thread, making them ideal for both landscape photography and everyday field work. This is a good choice for those who want full control over exposure without complicating their workflow. Irix screw-in ND filters are designed with high optical quality in mind, which is crucial for long exposure times. The absence of unwanted color casts and high resistance to flares allow you to focus on composition rather than later correcting images in post-production. This is a solution appreciated by both photographers working on a tripod and filmmakers using classic photographic setups.

Irix MMS system – magnetic ND filters for filmmakers

A separate category includes magnetic ND filters operating within the Irix MMS system. And here is a very important point worth emphasizing clearly: the Irix MMS system is designed exclusively for Irix Cine lenses. This is not a universal solution and does not fit all lenses – it was created strictly for the needs of filmmakers working with Irix cinema optics. The magnetic MMS mounting system significantly speeds up work on set. Filters can be attached and removed instantly, which is extremely important when lighting conditions change dynamically and when working in difficult environments. This solution is designed for workflow fluidity, shot repeatability, and precise exposure control in filmmaking. If you work with Irix Cine lenses, ND filters in the Irix MMS system become a natural extension of the entire setup.

How to choose an ND filter for your applications?

Choosing the right ND filter depends primarily on how and with what you shoot photos or video. If your main focus is landscape photography, architecture, or experimenting with long exposure, screw-in ND filters will be the most universal solution. They allow you to work calmly, precisely, and without haste, providing full control over the final effect. Magnetic filters in the Irix MMS system, on the other hand, are a strictly filmmaking tool, designed for a fast pace of work and compatibility with Irix Cine lenses. This is a solution appreciated by operators working on film sets, where every second and repeatability of settings matter.

How to choose ND filter density for conditions and effect?

Different ND filter densities allow you to match the effect to the conditions and the intended result. Lighter filters, such as ND2 or ND4, work well for slight exposure correction; medium ones like ND8 or ND16 for moderate light and gentle exposure extension; while stronger ones – ND64, ND128, or ND1000 – are essential for long-exposure photography in full sunlight. The higher the filter density, the greater the exposure extension, but also the higher the requirements for stability and precision. Variable ND filters offer convenient, smooth adjustment, but at extreme focal lengths (very long or very wide) they may cause uneven darkening of the frame, loss of image quality, or color casts, which is why they work best in dynamic conditions rather than situations requiring maximum quality and repeatability. Finally, it is worth mentioning that ND filter density increases exponentially with each version, meaning ND2 is a twofold extension, ND4 fourfold, and so on.

ND filters as a creative tool

Irix ND filters are more than just a technical accessory. They are a tool that allows you to consciously shape the image, control motion and time, and give photos and films character. Whether you want to smooth the surface of a lake, show the dynamics of the sky, or maintain a cinematic look in harsh sunlight – a well-chosen ND filter makes a huge difference. If you are interested in long-exposure photography, cinematic-style films, or simply greater control over light, Irix ND filters are a solution worth considering – provided you choose a system suited to your equipment and working style.