Profoto

Profoto 100520 RFi Speedring Speedlights Softbox Adapter

3.7 (23 reviews)

Bring Profoto RFi softbox quality to your speedlight setup — the RFi Speedring turns any flash into a professional light-shaping platform.

$174.49*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Profoto RFi Speedring is the adapter that collapses the barrier between speedlight photography and professional large-format light shaping. Most photographers building a portable kit reach a ceiling where their speedlight's output or the modest quality of its modifier holds back the work — the RFi Speedring addresses both constraints simultaneously. It mounts to any Profoto RFi softbox and accepts virtually any speedlight inside its holder, allowing shooters to deploy large, high-quality diffusion panels that produce the gradual, flattering light transitions that small flash modifiers simply can't replicate. The dual-speedlight capability further extends output headroom, making full-frame portrait and commercial work achievable with two speedlights where a single flash would fall short.

The Speedring's mechanical design prioritizes flexibility: independent slide-and-tilt adjustment of the speedlight holders allows you to tune where the flash energy lands inside the box, directly affecting the evenness of light across the diffusion panel. Full 360-degree rotation and tilt on the ring itself means you're repositioning the modifier's output direction rather than repositioning the entire stand between setups. Build quality is consistent with Profoto's professional standard — the ring locks securely into RFi softboxes and holds its position under real-world rigging conditions. For photographers who want Profoto's light quality without the full investment in battery packs or monolights, the RFi Speedring is the most cost-efficient entry point into that ecosystem.

Key Features

Get access to the entire range of RFi softboxes.

Mount a softbox on your speedlight and create a soft and flattering light.

Attach two speedlights and light up an even larger softbox.

Slide and tilt the speedlights inside the softbox to eliminate hotspots.

Tilt, rotate 360 and adjust the softbox high wise on the fly.

Specifications

Type
RFi Speedring (Softbox Adapter)
Compatibility
Profoto RFi Softboxes; virtually any speedlight
Speedlight Capacity
Up to 2 speedlights simultaneously
Adjustment
Tilt, 360-degree rotation, vertical height adjustment
Brand
Profoto
Model
100520
ASIN
B00F92EQ7C

Pros & Cons

👍 Pros

  • Universal speedlight compatibility gives shooters access to the full Profoto RFi softbox catalog without investing in Profoto monolight or battery pack systems
  • Dual-speedlight mounting significantly increases available output, making larger RFi modifiers practical with speedlights alone
  • Independent slide-and-tilt adjustment of speedlights inside the box enables effective hotspot elimination — a critical quality difference from basic speedlight adapters
  • Full 360-degree rotation and tilt on the Speedring allows precise softbox repositioning without stand adjustment during fast-moving portrait sessions
  • The RFi system's modifier range is extensive — investing in this Speedring opens a long equipment roadmap of softboxes, strips, and octas

👎 Cons

  • The Speedring itself is just the adapter — all RFi softboxes must be purchased separately, making the total investment significantly higher than the Speedring price alone
  • Speedlights inside a softbox require radio triggers or optical sync to fire, adding another variable (and potential failure point) compared to a monolith with a built-in sync port
  • Two speedlights firing simultaneously can cause overheating during high-volume sessions — thermal throttling on the flashes is a real on-location concern
  • The Speedring adds physical bulk and weight compared to using speedlights bare or with smaller modifiers, complicating one-light travel kits
  • Recycling times for speedlights are slower than monolight equivalents, which limits shooting pace in fast-paced event or portrait environments

Frequently Asked Questions

No Profoto flash required. The RFi Speedring is designed to work with virtually any speedlight — Canon, Nikon, Sony, Godox, and most other hot shoe flashes slot into the universal speedlight holders inside the ring. This is the key value of the adapter: it extends the entire Profoto RFi softbox range to shooters whose primary flash system is speedlights rather than studio monolights.
Yes — the RFi Speedring accommodates two speedlights at once, positioned inside the softbox. Running two flashes in the same modifier increases total output significantly, allowing you to drive larger RFi softboxes (which need more power to fill evenly) or to shoot at smaller apertures and lower ISOs in bright ambient conditions where a single speedlight would underexpose.
The RFi Speedring allows you to slide and tilt each speedlight independently inside the softbox cavity. By angling the flash heads so they fire toward the silver interior walls rather than directly at the front diffusion panel, you create a more even spread of light before it exits the softbox, significantly reducing the central hotspot that direct-firing causes.
The Profoto RFi Speedring provides access to the full RFi softbox range in all sizes and shapes — from small octas to large rectangulars. Larger boxes will benefit from the dual-speedlight configuration to maintain adequate output across the full diffusion surface. Smaller RFi modifiers work well with a single speedlight.
Yes. The RFi Speedring includes tilt, full 360-degree rotation, and vertical height adjustment, all adjustable on the fly without dismounting the modifier. This means you can reposition the softbox angle between shots without touching the light stand, which is useful during portrait sessions where you're adjusting the light-to-subject relationship frequently.