Perfect examples of ISO control for the best results
Aperture and shutter speed selection play a huge part in photography – now add ISO to the list
Will Cheung
ISO 400
1.2 secs
LOW ISO/SLOW SHUTTER SPEED
West Burton Falls in the Yorkshire Dales was in full flow and to achieve a milky water result, it required a slow shutter speed. With the camera and 70-200mm lens on a tripod, I took my first test shot at a speed of 1.2 secs at f/22 and ISO 400 and, although that produced a nice blur in the flowing water, I decided to go even slower. The first consideration was the tree branches, which I preferred not to blur. Thankfully, it was a still day so there was no problem here. To get a longer shutter, I dropped down from ISO 400 to ISO 100 to give an extra two f/stops of blur and the final exposure was 5 secs at f/22.