The digital push is a two step process that helps to capture sharper images in low light. This technique can be used in everyday hand-held situations of low light and high zoom.
When in doubt set a higher shutter speed for safety,
and brighten the exposure later with photo editing.
The slow shutter speeds needed to make a good exposure in low light can lead to camera-shake, a common cause of a ruined photograph. You can usually save an underexposed image, but there is no cure for motion or camera blur.
Borrowing from a traditional film techinque, you can "push" your digital camera by shooting for sharpness and then brightening the image later with the computer.
The Digital Push gets its name from the "push processing" technique: The photographer underexposes the image, but then later instructs the photo-lab to "push" the film by leaving it longer in the processing chemicals. This results in a brighter photo but with increased grain and contrast.