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Because looking through a direct-vision finder is like looking through a window, your eye can adjust to focus on close or distant objects. Just as when you are looking around you normally, whatever you look at appears in focus, so you get the impression that the whole scene is in focus. However, it’s by no means guaranteed that everything in the final shot will be in focus: things that seemed clear in the viewfinder may be blurred, even blurred beyond recognition.

Ribblehead Viaduct, North Yorkshire (Jon) When looking at the SLR finder the eye stays focused at a constant distance. This can weaken our sense of depth, but the third dimension is always there and in some shots it’s immensely important

With a reflex finder, and with the LCD screen, you actually view through the camera lens – the same lens that takes the picture. In a single-lens reflex (SLR) camera the image is relayed to your eye by a mirror that flips out of the way when the shutter is pressed. We can lump reflex viewfinders and camera-screens together as ‘through the lens’ (TTL) finders. Surely TTL viewing means that what you see matches the photo you’ll get? You can certainly be forgiven for thinking that it should, but it’s not that simple. Sometimes it gets very close, but at other times it doesn’t.