WindowCling D/N Layer (#8601) — steel blue day-for-night window film
An optically clear day-for-night film that cuts window light by 2.5 stops (18% transmission) and adds a steel blue moonlight tint. Rosco designed it to stack with WindowCling ND layers to reach the darkness you need.
Image: Rosco
Daylight outside, night on camera
#8601 darkens and cools the view through a window so a daytime shoot can read as night. Add WindowCling ND layers on top to take it darker.
- Reduces window light by 2.5 stops
- Adds a steel blue moonlight tint
- Designed to stack with WindowCling ND
- No adhesive — holds by static
- Typically holds about 4–6 weeks
- Removes and re-rolls for re-use
Built for day-for-night
Day-for-night interiors
Make windows read as night-time while shooting in daylight.
Moonlit looks
A cool, blue cast on window light for night scenes.
Layered control
Combine with ND3, ND6 or ND9 layers to fine-tune darkness.
What it is — and what it isn’t
Use it for
- Day-for-night window effects
- Glass or plastic windows
- Stacking with WindowCling ND
- Temporary installs on location
Don’t use it for
- Neutral (uncoloured) reduction — use ND3/ND6/ND9
- Total blackout — use E276 Blackout
- Permanent window tinting
- Dirty, wet or textured glass
Installing WindowCling (per Rosco)
- Clean the glass with a non-streak cleaner, dry and buff with a dry microfibre towel.
- Apply #8601 from an upper corner, aligning with the frame.
- Trim to the frame and smooth air out towards the edges.
- Add WindowCling ND layers on top until the window reads dark enough on camera.
- To remove, peel from a top corner and re-roll onto a core without creasing.
Key details
| Product | #8601 WindowCling D/N Layer |
|---|---|
| Rosco product number | 101086016025 |
| Transmission (per Rosco) | 18% (2.5 stops) |
| Tint | Steel blue (moonlight) |
| 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 |
| Hold time | Approx. 4–6 weeks, depending on conditions |
Common questions
What is a day-for-night window filter?
A film that darkens and cools window light so a daytime scene reads as night on camera.
How dark does #8601 make the window?
On its own it cuts 2.5 stops (18% transmission). Stack WindowCling ND layers for more.
Which ND should I stack it with?
Any WindowCling ND — ND3 (1 stop), ND6 (2 stops) or ND9 (3 stops) — depending on how dark you need.
Does it need adhesive?
No. It holds by static. Rosco’s fallback is soapy water and a squeegee.
Can I re-use it?
Yes. Peel it off, re-roll onto a core without creasing and store it in its bag.
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.
Related products
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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.
