Читать книгу Digital Photography For Dummies - King Julie Adair, Julie Adair King - Страница 36

This term is used to describe a standard viewfinder — the kind that's been used for a long time in both film and digital cameras. Optical viewfinders come in two forms:

 TTL (through-the-lens): The display is created by light coming directly through the lens.

 Non-TTL: For technical reasons I won’t bore you with, a TTL lens requires a larger, bulkier camera design. As an alternative, some cameras have non-TTL viewfinders, which simply means that the placement of the viewfinder is such that it has a slightly different angle on the scene than the lens. This results in parallax error: The viewfinder doesn't show exactly what the lens will capture, making it difficult to precisely frame a photo.To help solve the problem, most cameras include framing marks in the viewfinder to guide you; when camera shopping, be sure the framing marks are easy to see. And note that not all viewfinders of this type are created equal — the amount of parallax error varies from camera to camera, so do your research.