31st December 2013
What have I done?
I have photographed a series of portraits, to show the effects on an image as the ISO is adjusted throughout the scale.
What have I got from it?
I have noticed that the lower the ISO, the less grain/noise is recorded on the image. Depending on what ‘look’ one wants from their photography – whether it be moody and grainy, mysterious OR clean, clear and soft/pure – the ISO is the setting to play with. I think each end of the spectrum can look just as good when used in the right scene. Me personally, I like the ‘pure’ ‘clean and clear’ look to my images – maximising the detail recorded. Grainy/noisey or smudgy images make my eyes go funny and I find them difficult to make out.
I want to always aim to set the correct ISO for each scene and be dedicated to creating a particular look, an intention, to each of my images. To master this technique.
ISO 100. You can see the detail a lot more, the point of focus is more visible (and because ISO 100 would be dark without using a larger aperture, the image is softer around the edges as it drops out of focus, a result of using f4).
Another example at ISO 200:
ISO 6400. The image as a whole looks a little sharper as a result of the use of a smaller aperture, however when cropped at 100% the image looks smudgy/murky, less defined and you can see the noise the higher ISO has created.
Another example at ISO 6400
ISO in context
In regular, bright day light (or using flash as I tried out here) ISO 100 would be used because natural light has no problem flowing into the sensor, resulting in a lot of detail and clarity,
However at night the ISO has to be bumped up so the sensor get’s as much light in as possible. This results in a lot of noise and less definition.