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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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