Thread: ISO speeds
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Old 27-04-2008, 08:39 AM
shane shaw
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shane shaw is offline
Join Date: Mar 2007
Posts: 64
g'day mate. I am fairly new to photography especially astro Photography, however I believe that if you think of taking pictures of any subject at night with minimal light that 100 iso is just not going to work very well.

The smaller the F-stop number (or f/value), the larger the lens opening (aperture). this will allow more light in and give the the possibilty of using a lower iso.

So a high apeture (smaller opening) will allow less light in and require a higher iso. Just have to try and get a happy mix of the 2 and you will be fine.

As an example I went to a circus the other night and no flash was allowed and I took some really good photos just changing the iso, apeture and also shutter speed.

good luck I hope I have got it right
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