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Old Jan 30, 2006, 5:48 AM   #1
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Ok - This is what I understand the definition of the hyperfocal distance to be.

Hyperfocal distance is the distance at which the DOF willbe sufficiently deep to ensure everything from half the hyperfocal distance to infinity is in focus.

So, using the DOFMaster hyperfocal chart (check out http://www.dofmaster.com - it's really good), for my f1.8 50mm Canon EF Prime, if I set the camera to f22 (for example, as the hyperfocal distance becomes shorter as the aperture decreases) the hyperfocal distance is 11m so if I focus on something 11mm away then everything from 5.5m in front of the camera to infinity will be in focus. This is assuming a circle of confusion of 0.01mm as recommended for digital cameras by the DOFMaster software.

Am I interpretting this definition correctly?

Now, without a range finder or a distance scale on the lens it is difficult to know where 11m is and so I usually end up guessing where the right spot is. If I choose a distance greater than the hyperfocal distance what effect will that have on the DOF? Will less of the foreground be in focus whilst maintaining focus to 'infinity'?
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Old Jan 30, 2006, 6:40 AM   #2
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Yes you have it correct, and yes if you focus at a point beyod the hyperfocal distance less of the foreground will be in focus.

If you have a depth of field preview on your camera you'll be able to see this.


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Old Jan 30, 2006, 6:52 AM   #3
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ok - so I guess the tradeoff is to compose the shot so you can crop the lower portion off to give the illusion of continuity of DOF right?
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Old Jan 31, 2006, 5:37 AM   #4
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That's a possibility yes.
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