ISO Test Afternoon from georgie wing on Vimeo.
ISO evening test- from georgie wing on Vimeo.
What effect does ISO 100 have?
I started my ISO test in the afternoon while it was still light outside. I did this to ensure that I could use an ISO of 100 and still have a perfectly exposed moving image. Using as close to ISO 100 as possible means that the image will be less sensitive to light and therefore will have less noise/grain in the image. Noise/grain ruins the effect of the image by interfering with how clean the image looks.
What effect does ISO 1600 have?
Using a higher ISO such as ISO 1600 means that the camera is much more sensitive to the light and therefore more light will enter the image. Using a higher ISO is perfect if you are filming at night with no other source of lighting. However it is better to have an additional light source because using a high ISO leaves grain on the footage/shot. The image below shows how different ISO's can effect the image shot.
Using ISO 100 outdoors in the afternoon meant that my image was going to be overexposed, as a result of this I decided to raise my aperture so that less light could enter the image. I found using ISO 100 in the afternoon a lot easier than in the evening because I got a perfectly exposed moving image just by raising my aperture whereas in the evening raising my aperture to its limit still meant that the moving image was still underexposed. I was using a standard lens so therefore I could only raise my aperture to 4.5, this resulted in my footage being underexposed. To fix this problem I would have had to use a different lens. However that would have resulted in me having to compromise with the shot I wanted. If I had decided to use a different lens such as a wide angle lens then it would have effected my shot because the footage would have been wider and I would not have been able to pan to the other focal point of the footage which is what I wanted to do. Due to these challenges I found having to stick to the set ISO's of 100 and 1600 really difficult without having to compromise on either my exposure or my shot.
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