Under those conditions photographers shoot with a fast exposure time and small aperture. That makes it impossible to capture faint objects in a dark background, such as stars.

在这种情况下拍摄者会使用很短的快门时间并调小光圈，这样就不可能拍摄到黑色背景上那些很暗的物体，如星星。

youdao

What all this shows is that despite Paulson's efforts to shoot a silver bullet into the heart of the financial market turmoil, it's difficult if not impossible to succeed when the target is zigzagging as much as it is.

FORBES: Uncle Sam Pumps Up Citi