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 Post subject: Canon 400D dof?
PostPosted: Mon Nov 26, 2007 5:37 pm 
i have read thorugh the instuctions on the dof button over and over and still do not understand how to use it?

please could some one explain to me how to use it?

 Post subject:
PostPosted: Mon Nov 26, 2007 6:12 pm 
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Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9886
Location: UK
Hi Aidan,

When you press the button (with the camera switched on) the lens should reduce its aperture to the setting that the camera would command when you press the shutter release. That way you can get some idea of what DoF you will actually get rather than the narrower DoF you normally see through the viewfinder with the lens fully open.


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 Post subject:
PostPosted: Mon Nov 26, 2007 10:08 pm 
Here's an example:

In Aperture Priority mode (Av), dial your aperture to F/16.

Try zooming all the way in with your lens. (e.g. zoom to 55mm if you have the 18-55 kit lens.)

Focus on a close subject with a somewhat distant background. See how background is blurred in your viewfinder? This is the DOF effect when your lens is wide-open.

Now press the shutter and take the picture. See how the background is clearer in your picture than what you saw in the viewfinder? This is because the camera reduced the aperture from wide-open to F/16 to take the shot. A high F-stop (smaller aperture) means a larger DOF, meaning the background will be less out of focus.

Now with the exact same settings, focus on the same subject again, and press the DOF preview button. What you see through the viewfinder should be closer to the last picture you took. This is because the camera temporarily reduces the aperture to F16 to allow you to "preview" the true DOF with current settings.

What you also see with DOF preview is a much darker image through the viewfinder. This is because less light enters the camera when the aperture is reduced. This lack of light sometimes prevents you from using the DOF preview function effectively.

Finally, DOF preview is more useful with a film camera; it was pretty much the only way to see how your picture will look like before the film is developed. With digital cameras, you can simply take a picture, look at the result on a LCD, and adjust your settings accordingly.

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