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The Fuji X Series With Flash :: Part 2 – Off Camera TTL | Derek Clark

What Is TTL

I’ll start part 2 (part 1 is HERE) by describing what TTL actually is. Feel free to skip this part if you already know this. Back in the good old film days a lot of flash guns had a small calculator in the form of a chart or a small disk that rotated. These things basically calculated what setting worked for the Guide Number of the flash you were using. I had a Vivitar 283 back in the early 80′s, which was one of the most popular and reliable guns of it’s time. It had a dial built into the hinge of the bounce head (photo left). You set the dial to whatever ASA/Din number your film was (now called ISO) and the dial told you what distance you would cover with the varies apertures. The coloured sections corresponded to a dial on the front of the camera. It all goes a bit hazy after that…it was a long time ago. But I do remember having a cable that plugged into the front of the gun to use it off the camera.Fast forward to today and we have much more sophisticated flashes that talk to the camera and vice versa. The camera takes it’s exposure reading through the lens (TTL) and tells the flash the information it needs to know. The flash then works out how much power it needs to put out to achieve a good exposure. The flash gun can also let you know via it’s display if the right exposure was obtained……

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