Profoto 100991 Medium Umbrella Diffuser — main product image

Profoto

Profoto 100991 Medium Umbrella Diffuser

Name: Profoto 100991 Medium Umbrella Diffuser
Brand: Profoto
SKU: 100991

★★★★★4.7 (22 reviews)

Turn your Profoto medium umbrella into a softbox with this clip-on diffuser for softer, more controlled light.

$49.00*$70.00Save 30%

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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 100991 Medium Umbrella Diffuser is a purpose-built accessory that attaches over the front of Profoto medium shallow and deep umbrellas in white or silver finishes. By enclosing the open face of the umbrella, it transforms the modifier into something closer to a softbox — containing light spill, reducing harsh specular reflections, and producing a noticeably softer, more diffused illumination on your subject. This is particularly useful for portrait, beauty, and product photography where controlled, flattering light is essential.

The diffuser is lightweight and folds flat, making it easy to pack alongside your umbrella for on-location work. Installation is quick — it simply stretches over the umbrella's front edge. Photographers should account for the approximately 1.5-stop reduction in light output when planning exposures, which may require adjusting flash power or aperture accordingly. Backed by Profoto's limited 1-year warranty, this diffuser is a practical upgrade for anyone who already owns compatible Profoto medium umbrellas and wants more versatility from their existing gear.

Key Features

Limited 1-Year Warranty

Specifications

Brand

Profoto

Model

100991

Size

Medium

Compatibility

Profoto Medium Shallow and Deep Umbrellas (White and Silver)

Light Reduction

Approximately 1.5 stops

Warranty

Limited 1-Year

Pros & Cons

👍 Pros

Converts an existing Profoto umbrella into a softbox without buying a separate modifier
Reduces harsh specular highlights and produces a more even, wraparound light quality
Lightweight and folds flat for easy transport alongside your umbrella
Quick to attach and remove between setups

👎 Cons

Only compatible with Profoto medium shallow and deep umbrellas, limiting its use if you own other sizes
Reduces output by 1.5 stops, which may require you to increase flash power or open your aperture
Does not include a carrying case or protective sleeve
Premium price point compared to generic umbrella diffusion panels

Frequently Asked Questions

Which Profoto umbrellas is this diffuser compatible with?

It fits Profoto medium-sized shallow and deep umbrellas in both white and silver versions. It is not designed for small or extra-large Profoto umbrellas or umbrellas from other brands.

How much light does the diffuser reduce?

The diffuser reduces light output by approximately 1.5 stops, which should be factored into your exposure settings when attaching it.

How does this diffuser attach to the umbrella?

It stretches over the front opening of a compatible Profoto medium umbrella, converting the umbrella into an enclosed softbox-style modifier.

Does the diffuser come with a carrying case?

No dedicated case is included, though the diffuser folds flat and can be stored alongside your umbrella.

What is the warranty coverage?

Profoto includes a limited 1-year warranty with this diffuser.