Some of the world's most exquisite architecture and artwork are found in the darkest
spaces of churches and museums. To further complicate matters, many restrict
flash photography. By adjusting the ISO, you can leave the flash off, and still capture
well-exposed pictures. At a recent visit to St. Peter's Basilica in Vatican City, it was
not uncommon to shoot at extraordinarily high ISOs such as 6400 or 12,800. As
technology continues to improve, some high-end cameras now offer ISO 102,400 and
204,800. Essentially this allows a photographer to shoot in near darkness.
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