Key features

• •Remarkable Power and Coverage: With a Guide Number of 32 and an impressive underwater coverage angle of 100x100 degrees, the ST-100-Pro delivers stunning brightness and expansive illumination, allowing you to capture every detail of the underwater world
• •Compact and Lightweight Design: Despite its powerful performance, the ST-100-Pro maintains a lightweight and compact body, providing convenience and ease of use, both in and out of the water
• •Shutter-Linked Focus Light: The built-in shutter-linked auto-off focus light provides a powerful 800 lumens of brightness to assist with focusing on your subject. It automatically turns off in sync with the shutter release, optimizing battery life and simplifying your workflow
• •S-TTL Auto and Manual Flash Modes: The ST-100-Pro features an evolved and accurate auto exposure system, S-TTL, which ensures precise exposure control. Additionally, with 11 steps of manual flash control in 1/2EV increments, you have enhanced flexibility and control for professional-level photography.
• •Exposure control:optical cable/USB synchronize with TTL,adjust the luminosity(flash index),M grade by turnable button