Viewfinder Blackout is a problem in single-lens reflex (and also view cameras) where the viewfinder image is lost during the exposure- so the photographer cannot see the exact image at the moment the photograph is taken.
VIEWFINDER BLACKOUT
When you take a picture with a digital SLR, its mirror must swing up so the light can strike the shutter and image sensor. While up, you can't see through the viewfinder. This viewfinder blackout should be as short as possible.
Response time similar to the EOS-1V - 57 ms shutter release and 87 ms viewfinder blackout
Evaluative, Partial, Center-weighted, Spot and Multi-spot metering
Shutter speed range: Bulb, 30 - 1/16,000 sec (1/500 sec flash X-sync) ...
Continuous phase-detection autofocus even during video, live view or continuous shooting mode
Lack of camera shake due to mirror movement
No viewfinder blackout while taking photography
Shorter shutter lag
More compact body ...
 See also: Finder, Camera, Viewfinder, Image, Shutter
  
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