While there is not much I can do to help with the former, you can certainly fix the latter by changing the ISO level or “maximum ISO level” on your camera. If you are getting noisy images out of your camera, it could mean two things – either the size of the camera sensor is too small (as pointed out above) or the ISO level in your camera is too high. Now what happens when you couple a small sensor with high ISO sensitivity? That’s where you could get a trashed image, where you will not only see a lot of noise/grain, but also bad colors and all kinds of artifacts in the image. For example, increasing ISO from 100 to 200 doubles the sensor sensitivity and could therefore result in more noise. Basically, as you increase camera ISO, the amount of noise automatically increases as well. If you do not know what ISO is, I highly recommend reading my “ Understanding ISO” article that I wrote a while ago. The second source of camera noise is the sensitivity level of the camera sensor, known as ISO in photography. Consequently, smaller sensors with a large number of pixels generally produce noisier images. If you use a phone camera, you might see plenty of noise in images even during bright sunny days, which happens because too many pixels are crammed into a tiny sensor. 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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