Week 3 Research Questions

This week’s research for location is more about the use of flash, in this case a monobloc unit, as a main source with daylight being used as a fill source.  In other words, correct exposure will be based on the flash and daylight will be underexposed by two stops.

§   Daylight exposure is affected/controlled by your choice of shutter speed and aperture.                True / False?

§   Flash synchronisation is affected by your choice of shutter speed.             True / False?

§   Flash exposure is affected/controlled by your choice of shutter speed.         True / False?

§   You are photographing a subject in daylight where you wish the flash to be the main source and the daylight to be the fill at two stops less exposure than the flash exposure.
Procedure;

1.        Using a light meter (as opposed to “oh I don’t know, any old exposure will do because I’m lazy or confused from a night out”) you calculate the ‘correct’ daylight exposure to be 60^th @ f32.

2.        Set up your monobloc as a main source and adjust the output and/or distance (and using your light meter) until correct flash exposure is f32.

3.        Describe the resultant lighting if you exposed for daylight together with the flash on these settings.

        You would get a double exposure.

4.        Describe how you could now reduce the daylight exposure by two stops without affecting the flash exposure.  Hint: don’t even think about touching the monobloc unit for this, the answer is much simpler.
You could increase the shutter speed by two stops to 1/250 sec which is still in the flash sync range. The flash exposure will then remain the same because of  its fast flash pluse speed and the background will be reduced by 2 stops. 

5.        Having done this, now describe the resultant image in terms of what the subject looks like and what the background, which is lit by the daylight, looks like.

                                Correct Exposure