![]() This is because DSLR’s have much bigger sensors (full frame sensors can be 15+ times bigger in size than sensors in point and shoot cameras) and therefore can accommodate larger photosites compared to point and shoot. If you took a DSLR and a point and shoot camera and both have 10 megapixel sensors, the DSLR would yield a much cleaner image with a lot less noise when compared to the point and shoot image. This is where the size of the sensor comes into play. Generally, the smaller the photosite, the noisier the image gets. The size of the photosites plays a big role on the amount of noise that is present in the image. For example, if your digital camera is equipped with a 10 megapixel sensor, it means that there are 10 million photosites present on the camera sensor. Every digital camera is equipped with a sensor that collects light particles via very tiny buckets called “photosites”, which later become pixels in the final digital image. Let’s talk about the camera sensor first. Image noise originates from either the camera sensor or the sensitivity of the camera sensor, or sometimes both. See those tiny dots in the image? That’s what we call camera noise! 2) Causes of Noise While nothing seems to be wrong with the image, here is how it looks when viewed at 100%: NIKON D300 400mm, ISO 800, 1/1600, f/4.0 Take a look at the following image: NIKON D300 400mm, ISO 800, 1/1600, f/4.0 Those small dots might not be very noticeable when you look at the image on the back of the camera, but when you zoom in and view the image at 100% on your PC, they all of a sudden become quite visible. If you have a digital camera, whether you have an advanced top of the line DSLR, a mirrorless camera or a simple point and shoot, you will at some point get images with small dots all over the image.
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