1) Final amount 2) Final amt 
Through the lens. Through the lens metering measures the luminance after it has passed through the camera lens, thus providing readings or settings that allow for aperture and focus changes, filters, etc.
Time To Live / Transistor-Transistor Logic, details ...
transistor transistor logic.
Through The Lens + Transistor-Transistor Logic
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Time To LiveTransistor-Transistor Logic
1. Transistor-Transistor Logic. A term used in digital electronics mainly to describe the ability of a device or circuit to be connected directly to the input or output of digital equipment. Such compatibility eliminates the need for interfacing circuitry. TTL signals are usually limited to binary i.e.. two states, low and high, and are thus much m...
Through The Lens: A metering system in which a light meter within the camera body measures exposure from the image-forming light that has passed through the lens. (see Meter)
Transistor-to-transistor logic. A form of solid state logic which uses only transistors to form the logic gates.