Digital TTL

Jean-Sebastien Morisset · Issue 21, Oct/Nov 2004 · pp. 55–57

Products mentioned: Sony P&S, Sony housing, Ikelite DS-50, Canon 300D, Canon 20D, Olympus C-8080 Wide Zoom, Fuji S2 Pro, Canon EF-S 10-22mm f3.5-4.5 USM, Canon EF 28-105mm f3.5-4.5 II USM, Canon EF 100mm f2.8 Macro USM, Ikelite housing

Digital TTL by Jean-Sebastien Morisset My wife decided it was time to upgrade her underwater photography equipment. Sheʼs been using a Sony P&S with a Sony housing and Ikelite DS-50 for over 2 years, so this upgrade is long overdue. After looking over the features of different housings and cameras, she decided flash TTL was one of her requirements. This article explores the different options available, with flash TTL support, for underwater digital cameras in September 2004. Underwater housing and substrobe (underwater flash) manufacturers have found several ways to offer TTL support: Flash Sensor This is the most popular technique. It consists of mounting a flash sensor in front of the cameraʼs own flash, either inside or outside a transparent housing. The flash sensor detects the cameraʼs pre-flash (used for metering purposes), triggers a pre-flash in the substrobes, detects the real f…