bower ttl auto zoom flash for canon dslr

When the shutter is released, a preflash is fired before the actual shot is taken.Ģ. How the E-TTL II flash metering system worksĪ basic description of what happens when we shoot in E-TTL mode:ġ. All recent Canon EOS cameras run on E-TTL II. This is known as a flash metering system.ĭifferent camera manufacturers use different versions of TTL flash metering. The camera then automatically sets the flash output accordingly. In Start Flash Photography in 9 Steps, we learned that there are two flash modes you can use: E-TTL (Evaluative Through-The-Lens) mode or Manual mode.Į-TTL mode, also known as E-TTL autoflash, is the mode where the camera uses information obtained through the lens ('TTL') to calculate how much light the flash needs to emit for the appropriate brightness. (Reported by Yasuhiko Kani)Į-TTL flash metering: The function that measures the flash output needed for correct exposure In this article, we look closely at one key Speedlite technology: E-TTL II, also known as E-TTL (Evaluative Through-The-Lens) autoflash. Understanding more about your Speedlite helps you to take full advantage of it. External flashes (also known as clip-on /hot-shoe flashes) are a popular accessory choice for camera users to broaden their photographic expression.

Bower ttl auto zoom flash for canon dslr