Understand sensor size
Chris Rutter explains how the resolution and size of your camera’s sensor affects your shots
Discover the difference your camera’s sensor size and pixel count has on photos
Sensors can be confusing. What do your camera’s megapixel and sensor size numbers actually mean?
‘Megapixels’ are the number of pixels (or millions of pixels) in the image – its ‘resolution’, in other words. This roughly tells you how much your images can be enlarged without individual pixels becoming noticeable. It’s reckoned that for the highest quality prints, the image should be at least 300dpi (dots per inch), and you can check the table, right, to see the maximum print size at this resolution for a range of different megapixel ratings. There’s no sharp cut-off – you can go larger without suddenly losing quality, but this is still a useful comparison.
The physical size of the sensor affects your images (and your lenses) in a different way. Let us explain… But if you put the same lens on a DX camera you capture a smaller area/angle of view
A 28mm lens on an FX camera gives a wide angle of view
28mm lens, FX camera To get the same angle of view on a DX camera, you need an 18mm lens
18mm lens, DX camera