When you're shooting on a tripod in dim or low light, don't increase your ISO (your digital equivalent of film speed). Keep your ISO at the lowest ISO setting your camera allows (ISO 200, 100, or 50, if your camera's ISO goes that low, as shown on the Nikon menu above) for the sharpest, cleanest photos. Raising the ISO adds noise to your photos, and you don't want that (of course, if you're hand-holding and have no choice, like when shooting a wedding in the low lighting of a church, then increasing the ISO is a necessity, but when shooting on a tripod, avoid high ISOs like the plagueyou'll have cleaner, sharper images every time).
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