Pentax 40 MZ-3i TTL flash mode, Direct way to good flash shots, Setting procedure for TTL mode

3. TTL flash mode

Sensor

Fig.6 : Measuring scheme for TTL mode

The direct way to good flash shots

In TTL mode, the exposure readings are made by the sensor built into the camera (Fig. 6). This sensor measures the light reaching the film through the ￿ camera lens. An electronic control circuit within the camera transmits a stop signal to the flashgun as soon as the film has been exposed by the correct

amount of light; the flash is then instantly cut out.

The advantage of this flash mode is that all factors influencing the correct exposure of the film, such as filters, change of aperture and focal length with zoom lenses, extensions for close-ups, etc. are automatically taken into account.

☞The TTL flash mode can only be carried out with cameras that feature this function. The flashgun must be fitted with a corresponding SCA adapter (see SCA 300/3000 system instructions and SCA survey table).

Exposure corrections may be necessary with pronounced differences in contrast, for instance dark objects in snow (see ch. 15, p. 54).

3. TTL flash mode

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Fig. 7: Settings for TTL mode

Setting procedure for TTL mode:

•Adjust the camera according to the manufacturer’s Operating Instructions. •Fit the flashgun with the appropriate SCA adapter and mount it on the camera. 1 Switch on the flashgun with the main switch .

2 Set the operating mode selector			to TTL.
• *Press the ISO button		and adjust the film speed with the „+“ or „-“
button .
• *Press the ZOOM button		and use the „+“ or „-“ button			to adjust the
zoom value selected with the camera’s lens.
• If necessary, press the P button			and adjust the partial light output level with
the „+“ or „-“ button	(e.g. in winder mode).
• *Press the button	and use the „+“ or „-“ button			to adjust the same

aperture as on the camera.

*must additionally be set on some cameras.

☞In the event that film speed and aperture are not transmitted auto- matically, there is no need to make these settings manually; they are insignificant for a correct exposure. They are, however, necessary for correct indication of the distance.

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