When you’re starting out with flash, there’s a lot of ground to cover. Just working out which type of flash you want to use, let alone how to use it, is daunting. One of those questions is TTL or manual? In this article, we take a look at what TTL, or through the lens metering, actually is and how it works. We’ll also go over when TTL is the best option compared to when manual flash is preferable.