The technology of the reflex cameras
The sensor is the heart of the digital camera and allows it to work. Thanks to the sensor it is possible to “impress” what you want to photograph by transforming the analog signal into digital.
It detects the intensity of light that strikes it thanks to variations in the electric current generated or allowed to pass. Through the AD converter it translates the signal into a color resolution. The resolution of a digital SLR camera is measured in megapixels or MP: the ratio of number of pixels horizontally and vertically is 1.25: 1 ie 1.25 to 1.
This means that if you take a resolution of 5 megapixels you will have a number of 2560 pixels horizontally for 1920 pixels vertically (2560 x 1920).
These numbers are obtained by dividing the number of pixels by 1.25, then making the square root, always multiplying by 1.25. All this to say that between a 2 megapixel and a 5 megapixel the resolution does not increase by two and a half times ie the equation 5 Mp = 2 mp + 2 mp + 1 mp is not valid.
For a digital SLR camera, as you can guess, a large sensor determines higher output quality. So if you want even sharper photos, choose sensors for large cameras. Usually they are measured in inches so there is often a number accompanied by another in fraction. For example 1 ″ 1/2. Pay attention: being a fraction, the number below is inversely proportional ie 1/2 is larger than 1/3. It’s much more comfortable if instead the measurement is in millimeters as it is also common to find!