Higher and lower sensitivity

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.

From the left. ISO 200, 400, 800, 1600 and 3200

ISO 6400 used to achieve a shutter speed of 1/125 sec

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.

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About Anne Bryson

I live in Gloucestershire with my husband Iain and West Highland Terrier, Isla. I enjoy golf, photography and my grandchildren, not necessarily in that order! Having completed a 10 week digital photography course with the Open University in 2010, I decided I wanted to take my photography further and enrolled for the Open College of the Arts BA (Hons) starting with 'The Art of Photography' which I enjoyed so much that I went gone on to do Digital Photographic Practice and People and Place. In April 2016 I enrolled on my fourth OCA photography course, Documentary. This blog is my Learning Log for this course.
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