Research Questions Wk3 - Guide Numbers & Studio Flash Units

What is the Guide Aperture (GA) of both the Pulso and Primo units?
128

Let’s assume you had a flash unit with a GA of f64.  With a subject placed 4m from the flash head the f-number to use to achieve correct exposure would be;

[c] f32


Using the same flash unit as in question 2 above and a subject placed 16m from the flash head the f-number to use to achieve correct exposure would be;

[a] f8

Changing the Pulso 2 power setting from 10 to 9;

[a] halves the output

[b] reduces the output by 50%

[c] reduces the output by ‘1-stop’ (photo lingo)

[d] would require the use of a lens aperture 1 stop wider to achieve the same exposure



Describe what you understand by the term Symmetrical Power Distribution.
Power output will always be distributed evenly between multiple connected flash heads