[David Fitz-Henr]

Originally Posted by g__day

David,

Hope this suggestion helps. It boils down to if your darks are truely dark at the duration shot you wish, and you're still getting plenty of signal - then you should be laughing with ISO 400. Try it and see.

Matt

Thanks Matt,
I have been doing all my work at ISO 200 (just posted another three shots from Friday night), and was going to try ISO400 last night but smoke clouds from bushfire preventative backburning ruined what would have been a nice night - that and a massive dose of hayfever ! I may try it tonight if the smoke blows away (looking not too bad this morning).