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The Profoto Acute/D4 Ring Flash Head is soft light source that encircles the lens and supports the camera via the included mount. The head is compatible with Acute and D4 power packs.
Popular with fashion photographers, the Acute/D4 Ring is renowned for its unique catchlights, soft, flat output, nearly shadowless quality of light at a distance and haloed shadows when close to a background. The head employs a safety glass cover for its ozone-free quartz UV-coated flash tube which has a capacity of 2,400W/s and 9,600W/s per minute of continuous firing.
The Acute/D4 Ring ships with a glass safety cover and a 13' power cable. Optional accessories include Softlight, Close-up and WideSoft Reflectors.
Can be stand mounted or have camera mounted to it
Creates a direct light without harshness
Very safe to use thanks to the reduced UV flash tube and arc-proof connector
Compatible with a number of dedicated light shaping tools
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Circular flash tube with protective glass
Acute and D4 generators
Up to 9,600W/s per minute
Light Intensity Output
At 2,400W/s at 6.6' (2.0 m) @ ISO 100:
f/32.6 without reflector
f/22 with optional diffuser
f/45.4 with optional Pro Ring Softlight Reflector
f/45 with optional Pro Ring Close-Up Reflector
f/22.1 with optional Pro Ring WideSoft Reflector
User Replaceable Flashtube
Optional reflectors available
13' (4.0 m)
Modeling Light Wattage
No modeling lamp
Interior diameter: 4.0" (10 cm)
Exterior diameter: 8.6" (22 cm)
Overall: 7.75 x 8.25 x 9.0" (20 x 21 x 23 cm)