7D - tonights Moon

Started Dec 29, 2009 | Discussions thread
John Ott9 Junior Member • Posts: 32
Re: Why ISO 160?

You should also consider the atmospheric conditions. You are shooting through a five mile column of dancing air at a moving object that averages about 356400 km from earth. My experience is that the air is really steady only a few nights per month. Twinkle, twinkle little star is the bane of the astrophotographer and can cause blur even with fast shutter speeds. jot

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