Much high-end digital SLR cameras can generate grainy images in low flashing.
Low lighting has always been the enemy of photographers, who must strive to balance light and camera settings to discover the vein of a Gunfire. Digital SLR cameras maintenance with the hindmost, providing a Broad compass of settings and controls to beaten low burnished however with one hopeless by-product: digital noise, or grain. The whitish specs commonly inaugurate on pictures taken at elevated sensitivities and low shutter speeds are the telltale signs of digital noise.
Sensitivity
The sensitivity setting of your digital SLR camera controls the camera's ability to capture light. The numbers associated with ISO mimic the numbers that were previously assigned to film speeds, referred to as ISO numbers. ISO 100 film (and its digital equivalent) requires a lot of light to process; this setting is most appropriate for daytime shots outdoors. ISO 400 is appropriate for cloudy days; ISO 800 is a decent setting for shooting indoors or outside at dawn or dusk. Some high-end DSLR cameras have very high ISO ranges, up to and beyond ISO 3,200. These high ranges are useful for high-speed photography of moving objects; however, when a camera is set to a high ISO sensitivity and shots are given a long exposure, noise is inevitable. DSLR cameras are less prone to noise than their point-and-shoot counterparts, which have smaller, denser sensors.
Avoiding Grainy Shots
As you increase the sensitivity, you tell your camera to intensify the electrical signal that magnifies light, which creates the grainy look.
ISO and Noise
Each step between ISO settings on your camera results in a doubling of the electronic pulse. Therefore, ISO 200 is twice as strong as ISO 100, 400 is twice as powerful as 200 and so on.You can adjust camera settings to work around digital noise. First, refrain from shooting in your camera's "auto" mode. The camera will automatically adjust the ISO settings to compensate for light values and flash settings. If you have your flash turned off, the ISO will increase in any conditions other than sunny, well-lit conditions and noise will creep in. Shoot in "shutter priority" mode in low light on a constant, noise-less ISO setting. Every camera is a different in terms of when noise enters into photos, depending on the physical size of the sensor, but most DSLR cameras are noise-free up to ISO 800. Try shooting at 800 and adjust your shutter speed to balance the light.
Tripods
At a certain stage or time of day, holding your camera and shooting by hand will become a secondary problem and you'll have to choose between taking shots quickly and having some noise or setting up a tripod to maintain your ISO settings. Long exposure times (slow shutter speeds) let in more light to adjust for low-light scenes, but even slight vibration causes blur. To avoid blur and noise, keep your ISO setting low and use a tripod and a longer exposure. Fire the camera with a remote control or activate your self-timer to reduce vibration.
