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Thanks. Focus is basically the most important thing when shooting at night. You want the stars to be in focus in your images so you want your lens focus to be at true infinity. You can use the trial-and-error method to find true infinity (it is rarely right on your camera’s infinity symbol ∞) but the better method is to use your camera’s Live View. Use the electronic zoom function while in Live View to zoom in as far as possible on a bright star. Slowly move the focus ring back and forth until the star is as pinpoint as possible. Take note of where true infinity is located on your lens. Take some practice shots to make sure. Once you know it’s good you can always tape your focus ring down to prevent an inadvertent out-of-focus image using painter’s tape, masking tape, etc. This is always the first thing I do with clients when we get out in the field to shoot. You should regularly check your true infinity point every couple weeks at the most to make sure your focus is good.