Pertinent Pertinent was an Australian monthly periodical edited by Leon Batt. Contributors included Ian Mudie, Kylie Tennant, William Hart-Smith, the artist Rosaleen Norton and the poet Gavin Greenlees, Dulcie Deamer, Yvonne Webb, George Farwell, Marjorie Quinn, Marien Dreyer, and Robert Crossland Started in 1940 the magazine ceased publication in 1947.
Part of the Microprocessors glossary: Transistor-transistor logic (TTL) is a digital logic design in which bipolar transistor s act on direct-current pulses. Many TTL logic gate s are typically fabricated onto a single integrated circuit (IC).
We suggested that the external flash be set to the TTL mode. The TTL (i.e. , T hrough T he L ens) mode means that the camera will measure the output of external flash and stop the flash once illumination is sufficient.This is the easiest mode of using external flashes.However, do keep in mind that the Coolpix 990 is not true TTL cameras in terms of flash control. It measures flash illumination with a flash sensor next to the on-camera lens as shown below. As a result, what this sensor sees is usually not what the lens sees.his is the easiest mode of using external flashes. However, do keep in mind that the Coolpix 990 is not true TTL cameras in terms of flash control. It measures flash illumination with a flash sensor next to the on-camera lens as shown below.