The settings, glass-and-fence techniques and timing that turn zoo snapshots into wildlife portraits: continuous autofocus, shutter speeds for movement, rubber lens hoods, dark clothes, cleaner backgrounds, morning visits, and why the flash stays off.

Camera shake, subject movement, the wrong focus point, a focus mode that gave up, thin depth of field, a greasy lens. Nine reasons photos come out soft, how to tell them apart at full size, and the fix for each.

A crocus at f/2.8 and a pier at 30 seconds sit at opposite ends of one system. Here is how aperture, shutter speed and ISO trade light between them, and how to choose the setting that shapes the picture first.