Using the DOF preview button – why does it make the viewfinder dark?
If you’re struggling to manage depth of field in your images and don’t know how to judge it, or often download images that have been spoiled by insufficient depth within the frame being of an acceptable level of sharpness, the depth-of-field preview button will become your new friend – although it only works in the creative modes. Many people don’t use it as a cursory test just shows the image in the viewfinder going dark and it’s function isn’t immediately obvious, but there’s more to it than that and it’s a very useful tool to master. The button is located on the lower left area of the lens mount on the camera body, just under the lens release button and can be operated by your left thumb. When you take a photo, the iris in the lens – which is the hole in the centre of the lens the image goes through – opens to a pre-determined size as you take a photo – this is your aperture – a small number like f2.8 is a big hole and as a lot of light can get in through this wide hole, the shutter
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- Using the DOF preview button - why does it make the viewfinder dark?
