Rosco Polarising Filter #7300 – Polarising Lighting Filter for Reflection, Glare & Cross-Polarisation
Rosco Polarising Filter #7300 – Polarising Lighting Filter for Reflection, Glare & Cross-Polarisation
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The Rosco Polarising Filter #7300 (also called a polarising gel, polarising film, or lighting polarizer) is used to reduce reflections and glare in film, television, and photography lighting setups, as well as in display lighting, to reduce reflections and glare from surfaces such as glass, water, polished materials, and paper.
By filtering specific orientations of light waves, this linear polarising filter improves image clarity, enhances contrast and allows lighting professionals to control reflections directly at the light source.
What Does a Polarising Filter Do?
A polarising filter works by blocking certain directions of light waves while allowing others to pass through. This reduces specular reflections and glare from smooth surfaces such as glass, water, polished metal and glossy packaging.
In lighting applications, polarising filters are commonly used to improve image clarity and eliminate distracting reflections that would otherwise appear on camera.
- Reduces reflections from glass and shiny surfaces
- Improves contrast and colour clarity in images
- Controls glare in studio and location lighting
- Enhances visibility of textures and materials
Available Sizes
| Format | Size | Typical Use |
|---|---|---|
| Sheet | 43 cm × 50 cm | Lighting frames and small setups |
| Roll | 43 cm × 3 m | Studio lighting installations |
| Long Roll | 43 cm × 15.24 m | Film production and large lighting rigs |
The filter can be cut to size or mounted in lighting frames depending on the application.
Cross-Polarisation Lighting Technique
One of the most powerful uses of polarising filters is cross-polarisation.
In this technique, a polarising filter is placed over the light source while another polarising filter is placed on the camera lens. By rotating the lens polariser, reflections can be dramatically reduced or eliminated.
- Product photography and advertising shoots
- Filming glossy packaging or labels
- Capturing liquids and glassware
- Reducing reflections in museum displays
- Controlling reflections on automotive paint
Typical Applications
- Product photography lighting
- Film and television cinematography
- Retail display lighting
- Museum and exhibition lighting
- Interview setups involving reflective objects
- Glass and packaging photography
Technical Specifications
| Specification | Details |
|---|---|
| Filter Number | Rosco #7300 |
| Material | Acetate |
| Thickness | 6 mil |
| Colour | Neutral grey (minimal colour temperature shift) |
| Light Transmission | 38% (approx. 1.5 stops) |
| Finish | Natural curl due to material characteristics |
Installation Guidelines
- Mount in gel frames or filter holders in front of lighting fixtures.
- Ensure the coated side of the filter faces the subject.
- Use with a polarising filter on the camera lens for cross-polarisation.
- Keep distance between the filter and hot lights to prevent heat damage.
Usage Tips for Cinematographers and Photographers
- Rotate the camera polariser to adjust reflection levels.
- Test polarisation angles before filming or shooting.
- Combine with diffusion filters when shaping soft light.
- Handle carefully to avoid scratching the polarising layer.
Cautions & Disclaimer
- Do not place directly against hot lighting fixtures.
- Always allow airflow between the filter and the lamp.
- Polarising effects depend on light angle and surface characteristics.
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.
