WindowCling ND9 (#8609) — cut window light by 3 stops, no adhesive
An optically clear N.9 neutral density film that reduces window light by 3 stops (15% transmission). It holds to glass by static — no adhesive, no tape — and peels off to re-roll for the next job.
Image: Rosco
Controls daylight at the window
WindowCling is an ultra-thin ND film that sticks to windowpanes using static electricity. Stack layers to match changing daylight — Rosco says up to 8 stops before any noticeable colour shift.
- Reduces window light by 3 stops
- Optically clear neutral density
- No adhesive — holds by static
- Stacks with other WindowCling layers
- Typically holds about 4–6 weeks
- Removes and re-rolls for re-use
Film, TV and photo locations
Balancing interiors
Bring bright windows down so interior lighting and exposure work together.
Changing daylight
Add or remove layers as the light outside changes through the day.
Studios with windows
Control natural light in photo and film studios without permanent tint.
What it is — and what it isn’t
Use it for
- Glass or plastic windows
- Temporary installs on location or in studios
- Stacking for more density
- Re-using across projects
Don’t use it for
- Total blackout — use E276 Blackout
- Permanent window tinting
- Dirty, wet or textured glass
- Colour correction — it’s neutral density
Installing WindowCling (per Rosco)
- Clean the glass with a non-streak glass and plastic cleaner and dry it thoroughly.
- Buff the glass with a clean, dry microfibre towel to help build static.
- Starting at an upper corner, place the film and line it up along the frame.
- Trim the excess using the frame as a guide; smooth air out towards the edges (squeegee if needed).
- Stack further layers the same way. To remove, peel from a top corner and re-roll onto a core without creasing.
Key details
| Product | #8609 WindowCling ND9 |
|---|---|
| Rosco product number | 101086096025 |
| Transmission (per Rosco) | 15% (3 stops) |
| Substrate | Surface-coated, hi-tack polyester |
| Thickness | 1.4 mil (36 µm) |
| Roll | 60" × 25' (1.52 × 7.62 m) on a 2" (5.1 cm) core |
| Roll weight | 1.12 kg |
| Stacking | Up to 8 stops before noticeable colour shift (per Rosco) |
| Hold time | Approx. 4–6 weeks, depending on conditions |
Common questions
How does WindowCling stick without adhesive?
It holds to the glass by static electricity. A clean, buffed, dry window and low humidity help it cling.
How many stops does ND9 cut?
3 stops — Rosco lists transmission at 15%.
Can I stack WindowCling?
Yes. Rosco says layers can be stacked up to 8 stops before any noticeable colour shift.
How long will it stay up?
Approximately 4–6 weeks, depending on environmental conditions.
What if it won’t cling?
Re-clean and buff the glass. Rosco’s alternative is to apply with soapy water and a squeegee.
Specifications are from Rosco WindowCling technical data. How long WindowCling holds depends on temperature, humidity and how clean the glass is — test a section on the actual window before the job. Figures and advice on this page are a guide only.
Need help choosing?
Tell us what you’re working on and we’ll point you to the right product for the job.
Available Size
| Format | Size | Notes |
|---|---|---|
| Roll | 1.52 m × 7.62 m | Approximately 20% more material than standard ND filter rolls |
The wider roll allows larger window coverage with fewer joins compared to standard lighting filter materials.
Rosco WindowCling Filters
Rosco WindowCling is a range of removable lighting control films designed to reduce daylight, shape natural light and create lighting effects through windows without the need for permanent adhesives.
Using static cling technology, WindowCling films attach securely to glass surfaces while remaining easy to reposition or remove. This makes them ideal for film and television production, photography studios and temporary lighting control on location.
Why Choose Rosco WindowCling
- More coverage per roll – the 1.52 m width provides approximately 20% more material than standard ND filter rolls
- Stackable filters – multiple WindowCling layers can be applied to increase light reduction as needed
- Reusable material – remove and reuse across multiple productions or installations
- Static cling installation – no adhesive required, making installation cleaner and easier
- Save time on set – faster installation and removal compared to taped ND gels
- Reduce material costs – reusable filters help lower replacement and consumable costs
Common Applications
- Controlling daylight entering film and TV sets
- Reducing brightness through large windows
- Studio lighting control for photography
- Temporary ND solutions on location
- Retail displays and exhibition lighting control
WindowCling DN – Day / Night Filter
The WindowCling DN (Day/Night Filter) features a distinctive Blue Steel tint designed to simulate nighttime lighting conditions during daytime filming.
- Creates a cool blue moonlight tone
- Used for day-for-night filming
- Reduces daylight levels while maintaining a cinematic blue tint
- Commonly applied to windows on film and television sets
You can explore the available DN filters here: View the WindowCling DN Filters
Need Complete Blackout?
If you need to completely block light through windows rather than reduce it, Rosco also offers a dedicated blackout material used in film and theatre productions.
E-Colour 276 Blackout provides full light blocking and is commonly used to black out windows for controlled lighting environments.
Explore the WindowCling Range
Rosco WindowCling filters are available in several densities and effects designed for daylight control and creative lighting.
Installation Tips
- Ensure the glass surface is clean and free from dust or grease.
- Lightly mist the glass with water to assist positioning if required.
- Apply the WindowCling film and smooth out any air bubbles.
- Additional layers can be applied to increase light reduction.
- The film can be removed and reused for future setups.
Cautions & Disclaimer
- Always test WindowCling films on a small area before full installation.
- Ensure glass surfaces are clean before applying the film.
- Environmental conditions such as humidity and temperature may affect installation.
All technical data, recommendations and service are accurate to the best of our knowledge. Rosco assumes no responsibility for results obtained or damage incurred from use since method of application and use are beyond our control.
