A dull day, ideal for the exercise on using different ISOs. I took some pictures of ducks in a local pond and as well as looking at the graininess of the images, I needed to find a way of getting the pictures reasonably sharp as the ducks were moving about. At ISO set to 200 and aperture at f/18, I could only get a shutter speed of 1/4 sec. ISO 400 gave me 1/8 , 800 – 1/15 sec and in fact I had to go up to 3200 to get a shutter speed of 1/60 sec, which was just about ok when the camera was hand-held. I could have used a wider aperture, but the purpose of this exercise was to look at the differences that changing the ISO made.
In the pictures I took for this exercise, although those taken using a higher ISO are more grainy, this isn’t really an issue, it is more important that the picture is sharp.
I recently used higher ISO settings to take pictures in a church whilst on holiday where flash was not permitted and also to take some pictures outdoors at night. This really is a useful tool to have at my disposal and as is suggested in the text, is something that I will use as a matter of course in the future.