Task 3
This includes a review of previous theory and a simple research task for week 4.
1. Complete the following list of f-numbers (do not use 1/3 stops)
f1.0 f1.4 f2.0 f2.8 f4 f5.6 f8.0 f11 f16 f22 f32
2. In a given studio portrait situation where the subject is lit by one source and a reflector, if an incident light
reading of the lit side is f16 and an incident light reading of the side lit with reflected light is f1.4 then the
difference in illumination will be;
[a] 5 stops
[b] 6 stops
[c] 7 stops
[d] 8 stops
3. The difference in illumination described in question 2 above expressed as a ‘lighting ratio’ will be;
[a] 4:1
[c] 8:1
[c] 32:1
[d] 128:1
4. If the maximum output of a powerpack is 1200J, the output of the same powerpack when set on half power
will be;
[a] 1600J
[b] 1200J
[c] 800J
[d] 600J
5. If in the situation described above in question 4 an incident light meter is used to measure the output of the
powerpack set to maximum output and from a given distance is f22, the new f-number at the same distance
when the powerpack is set to half power will be;
[a] f22
[b] f16
[c] f11
[d] f8
6. In a given situation you are using two powerpacks to photograph a subject using multiple discharges, eg. 10 sequential discharges. One powerpack is set to a greater output level than the other. You need to decide which pack will be the master pack to be triggered from the camera and which will be the slave pack triggered either optically or via another method from the master.
Describe which pack will be the master and why.
The master pack would be the one with the higher output as it is closer to the camera and will defiantly trigger and also with its higher out put it will simultaneously trigger the lesser output flash since the light is stronger it will reach the triggering antenna on the lesser output pack. The higher output pack is also closer to the camera so if you were using a cable to trigger the flashes you wouldn't have to get such a big one to run through the entire set.
