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There’s an even more significant reason why what you see in TTL viewing isn’t always what you get. This is all to do with something called depth of field. We’ll explore this in more detail in ssss1, but for now, depth of field simply means what is in focus and what isn’t. If the image shows one object sharply focused, with everything else out of focus, depth of field is small. If, however, objects both nearer and more distant also appear in focus, depth of field is large.

Druidston, Pembrokeshire (Chiz) Focus is on the closest grasses, depth of field is small, and distant landscape soft

Focusing and depth of field: what’s sharp and what’s not

While a direct-vision finder gives you the impression that everything is in focus, with an SLR you can often see that some things are in focus and some aren’t. Focus on a nearby leaf and the distant landscape may well appear soft. This could be a good thing if you want to concentrate attention on that leaf. The problem is that when you take the shot, the background sometimes looks much sharper than it did in the finder or screen. In other words, depth of field in the shot is much greater than in your TTL view.