Monday, 19 June 2017

lens - Why do we need a DOF preview button?


Why not just show the effective depth of field, by default?


What's the point of having it display a picture that's different to how the image will actually turn out?


My first thought was, it must be to allow more light in while composing a shot. But it's weird, because when I attach/enable a flash; the display goes from pitch black to perfect vision (without actually firing the flash, or using the DOF button). So, it seems obvious there are other ways to harness enough light to adequately compose an image.





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