This continues a series of tips I’m going to publish for new photographers. For those of you who already know this stuff, I promise to keep the more advanced posts coming for you.
Bev Haggen from New York City wrote me and asked:
What is TTL?
TTL stands for through the lens. When you look through the viewfinder of DSLR, youre looking through the lens (TTL.) You’ll see the actual composition recorded on the sensor. When you use a non-DSLR such as a typical point and shoot or compact digital camera, or a range finder camera, youre looking through a viewfinder and not through the lens itself. This factor can introduce something called parallax error, a visual distortion error resulting from the difference in apparent direction of an object as seen from two different points. In other words, you’ll photograph a slightly different picture than what you saw through in the viewfinder. Parallax error increases as distance to your subject decreases. This makes photographing close ups problematic, and is why serious photographers tend to prefer DSLRs.