1. Introduction
The SmallRig RA-D55 Parabolic Softbox is a professional light modifier designed for photographers and videographers. It features a quick-release mechanism for rapid setup and disassembly, making it ideal for various shooting environments. This softbox is compatible with SmallRig RC series lights and other Bowens mount lighting fixtures, providing soft, even, and controllable light for enhanced visual results.

Figure 1: SmallRig RA-D55 Parabolic Softbox highlighting its all-in-one quick release design.
2. Package Contents
Verify that all items listed below are included in your package:
- Softbox x 1
- Honeycomb Grid x 1
- Internal Diffusion Cloth x 1
- External Diffusion Cloth x 1
- Carry Bag x 1
- User Manual x 1

Figure 2: Visual representation of the package contents for the RA-D55 Softbox.
3. Setup
The RA-D55 Parabolic Softbox features a quick-release design for efficient setup.
3.1 Assembling the Softbox
- Remove the softbox from its carrying case.
- Place the softbox on a flat surface with the Bowens mount facing upwards.
- Gently press down on the center of the Bowens mount with both hands until the softbox expands and locks into its parabolic shape. You will hear a 'click' sound as the ribs lock.
- Attach the internal diffusion cloth to the interior of the softbox using the integrated Velcro fasteners.
- Attach the external diffusion cloth to the outer edge of the softbox, securing it with the Velcro.
- For more controlled light, attach the honeycomb grid to the outer edge of the softbox using its Velcro fasteners.

Figure 3: Illustrated steps for quick assembly and disassembly of the softbox.
3.2 Attaching to a Light Source
- Align the Bowens mount of the softbox with the Bowens mount on your compatible LED light (e.g., SmallRig RC 120D/B, RC 220D/B).
- Insert the softbox mount into the light's mount and rotate clockwise until it locks securely.
- Ensure the softbox is firmly attached before operating the light.
Video 1: Official SmallRig guide on how to install and remove the Parabolic Softbox.
4. Operation
4.1 Light Diffusion and Control
- The dual diffusion cloths (internal and external) provide a soft and even light output, reducing harsh shadows.
- The included honeycomb grid narrows the beam angle to 45°, offering precise control over light spill and direction. This is particularly useful for accentuating subjects and creating dramatic lighting effects.

Figure 4: Accessories for light diffusion and control, including the honeycomb grid.
4.2 Wide Range of Applications
The RA-D55 softbox is versatile and suitable for various photography and videography scenarios, including:
- Portrait photography
- Studio photography
- LED video light photography
- Flash photography
- Live streaming and video production

Figure 5: Examples of the softbox in use for different creative applications.
Video 2: SmallRig's demonstration of the softbox's compatibility and various uses.
5. Maintenance
5.1 Cleaning
- To clean the exterior fabric, use a soft, damp cloth. Avoid harsh chemicals.
- The diffusion cloths can be gently hand-washed with mild soap and air-dried.
- Ensure all components are completely dry before storing.
5.2 Storage
After use, disassemble the softbox by pressing the release tabs on the Bowens mount and allowing the ribs to collapse. Store all components in the provided carry bag in a cool, dry place to prevent damage and prolong product life.
6. Troubleshooting
6.1 Softbox Not Opening/Closing Smoothly
- Ensure all 16 ribs are properly aligned and not bent.
- Apply gentle, even pressure when expanding or collapsing the softbox. Avoid forcing the mechanism.
6.2 Light Leakage
- Verify that the diffusion cloths are securely attached with all Velcro fasteners.
- Check the connection between the softbox and the light source to ensure it is fully seated and locked.
7. Specifications
| Brand | SMALLRIG |
| Model Number | RA-D55 (3585-AU-02) |
| Product Dimensions | 21.65 x 21.65 x 14.57 inches (55 x 55 x 37 cm) |
| Opening Softbox Size | Φ550.0 x 370.0mm (21.6" x 14.6") |
| Item Weight | 4.29 pounds (1.95 kg) |
| Material | Oxford Cloth, Aluminum Alloy |
| Mount Type | Bowens Mount |
| Compatibility | SmallRig RC 120D/B, RC 220D/B, and other Bowens Mount lights |
8. Warranty and Support
SmallRig products are designed for durability and performance. For warranty information, technical support, or service inquiries, please refer to the official SmallRig website or contact their customer service directly. Keep your purchase receipt for warranty claims.
Visit the SmallRig Store for more products and support.





