How to Attach a Softbox to a Balcar Speedring

By Fotodiox, Inc. USA | Published: 2026-10-21

Category: How-to Guides

Learn how to securely attach a softbox to a Balcar speedring, including tips for lantern and parabolic softboxes, common mistakes, and compatibility notes.

Quick Answer

Align the speedring's locking tabs with the softbox's mounting bracket, rotate to lock, then secure the thumb screw. For Balcar strobes, ensure the speedring is fully seated before tightening.

Understanding Speedring Compatibility

A Balcar speedring is a common mount for studio strobes, but not all softboxes share the same locking mechanism. The Fotodiox Lantern Softbox uses a rotating speed ring with a thumb screw lock, which works with Balcar and Flashpoint I strobes. The Fotodiox Deep EZ-Pro Parabolic Softbox uses a Multiblitz P speedring, which is physically different and not cross-compatible without an adapter.

Before starting, confirm your softbox's speedring matches your strobe's mount. If you're using a Balcar mount, the Fotodiox Lantern Softbox is a direct fit. For Multiblitz P mounts, the EZ-Pro Parabolic Softbox is the correct choice.

Common Mistakes to Avoid

Forcing the speedring onto the strobe when it's not aligned can damage both the speedring and the strobe's locking ring. Always rotate the speedring gently until it clicks into place. Another frequent error is overtightening the thumb screw, which can strip the threads or crack the speedring's plastic housing.

If your softbox has an inner baffle or outer diffuser, attach those after the speedring is secure. Installing them first can block your view of the locking mechanism.

Step-by-Step: Attaching a Softbox to a Balcar Speedring

1. Prepare the Softbox and Strobe: Unfold the softbox and locate the speedring. Ensure the strobe is turned off and unplugged. Align the speedring's locking tabs with the strobe's mounting ring. Check that the speedring's tabs are fully retracted before attempting to attach.
2. Seat the Speedring: Press the speedring onto the strobe's mounting ring until it clicks or sits flush. Rotate the speedring clockwise until the tabs lock into place. You should feel resistance when it's fully engaged. If it doesn't click, rotate the speedring slightly counterclockwise and try again. Never force it.
3. Tighten the Thumb Screw: Turn the thumb screw clockwise until it is snug against the strobe's mounting ring. Do not overtighten. The screw prevents the speedring from rotating loose during use. If the screw feels loose after tightening, the speedring may not be fully seated. Remove and repeat step 2.
4. Attach Diffusion Panels (if applicable): For softboxes with removable inner baffles or outer diffusers, attach them after the speedring is secure. Most softboxes use hook-and-loop strips or snap buttons. Attaching panels before the speedring can block your view and cause misalignment.
5. Test the Connection: Gently tug the softbox to confirm it is locked. Tilt the strobe head slightly to check for any wobble. If the softbox moves independently of the strobe, the speedring is not fully locked. A wobble indicates an incomplete lock. Repeat steps 2 and 3 before using the light.

Products That Make the Job Easier

Fotodiox Lantern Softbox with Balcar Speedring for Balcar and Flashpoint I Strobes - Collapsible Globe Softbox with Partial Silver Reflective Interior and Soft Diffusion Panels: Rotating Speed Ring with thumb screw lock; compatible with Balcar and Flashpoint I strobes. The thumb screw lock lets you secure the softbox quickly without tools, reducing setup time on location.
Fotodiox Lantern Softbox with Balcar Speedring for Balcar and Flashpoint I Strobes - Collapsible Globe Softbox with Partial Silver Reflective Interior and Soft Diffusion Panels
Fotodiox Deep EZ-Pro Parabolic Softbox with Multiblitz P Speedring for Multiblitz P, Compact, and Compatible - Quick Collapsible Softbox with Silver Reflective Interior with Double Diffusion Panels: Features a Multiblitz P speedring; designed for Multiblitz P, Compact, and compatible strobes. If your strobe uses a Multiblitz P mount, this softbox eliminates the need for an adapter, ensuring a stable connection.
Fotodiox Deep EZ-Pro Parabolic Softbox with Multiblitz P Speedring for Multiblitz P, Compact, and Compatible - Quick Collapsible Softbox with Silver Reflective Interior with Double Diffusion Panels