Through the lens
As Through the Lens (TTL;. English for "through the lens [through]") is known in the photography all through the lens taking place through measurement and control operations.
A distinction is made primarily between
- Methods of measuring exposure through the lens:
- TTL exposure metering , also indoor metering
- TTL flash measurement , also internal flash measurement
- TTL pre-flash
- Methods of measuring focus ( depth of field ) through the lens: