Quantum Qflash X4d Instruções de Operação descarregar pdf (Página 36)

Now the system is set up for perfect portrait lighting, with no metering

needed. The on camera Qflash (Control) which is producing a flat light will

shut off one stop below the lens setting (Fill). Remote 1 Qflash will pro-

duce a light from the left (loop lighting) that is equal to the lens setting

(Main). This will achieve the portrait 3:1 ratio. The ratio can be adjusted by

changing the F number of the Control Qflash and the linked ratio.

For a ratio of 5:1 set the F number of the Control Qflash to 2 stops below

the lens setting, and set the Linked ratio to +2.

10.2 Auto flash and the Auto Sensor Limit

Setting Qflash to Auto exposure makes picture taking fast and easy. But

an automatic flash has a flaw: the sensor on the flash expects the subject

to be wide, flat, and fill the view of the sensor. A person standing against

a wall fits this description; people in a catering hall or in a park at night do

not. When the background is located far behind the subject, the automatic

flash struggles to produce an even light. The result is often an over

exposed subject, sometimes by as much as two stops. When a photo lab

develops a picture with a greatly over exposed subject it will ‘print down’

to bring the flesh tones back into range. This will cause the background to

go dark.

To solve this problem use the Flash sensor limit (see Section 5.7, Option

Menu 2).

The flash Sensor Limit function essentially

cuts down on the distance that the sensor will

look for the subject. See the examples shown

below.

Open field

The subject is located 15 feet from the cam-

era. The closest background is a group of

tress 40 feet behind the subject. By setting

the Sensor Limit to 15 feet, the flash will read

only the light from subjects within 15 feet,

ignoring anything further.

Two subjects separated by a gap

Sometimes two subjects are separated by a

gap. When this occurs the sensor is ‘looking’

between the two subjects and may miss

them. The Sensor Limit will correct for this by

reading only the light from objects within the

limit set, in this case, 15 feet. The light from

objects further away will be ignored.

With the Sensor Limit it is no longer neces-

sary for the subject to be centered in the

frame. As long as the subject is within the

Sensor Limit it will be lit properly.

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