Digital photography uses ISO settings to respresent how sensitive the image sensor is to light. In film photography it was shown as an ASA value. For example 100, 200, 400.
The benfits of digital photogrpahy is that you can change this setting for each individual shot whereas before you would have to change the entire film.
Generally speaking the higher the ISO setting the more sensitive the camera will be to light. This will give more grain or noise on the image.
Below are two images showing the difference between ISO settings. The first taken with an ISO of 200 and the second at 3200. Note that the first had a shutter speed of 1/250s whilst the second required a shutter speed of 1/3200s to match the expossure of the first.
Obviously it would be ideal to use the lowest setting all the time as you would end up producing clearer images. However this is not always possible, for example when the subject of your photo is poorly lit. This could be at an indoors event or at night. In these situations choosing a higher ISO setting will allow you to capure a clearer image whilst not having to compromise the shutter speed. Hence allowing me to still be able to freeze fast moving subjects.
My post titled 'Inital Shot' shows some of my images taken at night using a high ISO setting.
Hi
ReplyDeleteThis ISO section and how you have written it is clear and concise and you have linked it to a gallery of your images (initial shots).
This will meet 1.1,1.3,1.4,.16.,1.7,1.8,2.2.
Also this blog itself will tick off 2.4 as you are using feedback from me to help improve your meeting of criteria.
steve