Workshop 2 – Studio Research 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_f2.8_ f4_ f5.6_ f11_f8_ 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;
[b] 7 stops
3. The difference in illumination described in question 2 above expressed as a ‘lighting ratio’ will be;
[c] 8:1
4. If the maximum output of a power-pack is 1200J, the output of the same power-pack when set on half power
will be;
[d] 600J
5. If in the situation described above in question 4 an incident light meter is used to measure the output of the power-pack 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;
[c] f11
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 diagram below may help.
The higher output flash would be the master and the lower output would be the slave.
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