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Depth of Field question
Old 05-21-2006, 01:00 PM   #1 (permalink)
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Assuming the same aperture and effective focal length of the lens, if DOF the same for digital and film? I've not done a test, but my impression is that on my 20D f 4 is more like f8 on my 35mm film camera. I'm wondering if the sensor coverage factor makes a difference. Could be that it is just my imagination.. Anyone know or seen anything on this?

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Re: Depth of Field question
Old 05-21-2006, 01:34 PM   #2 (permalink)
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Quote:
Originally Posted by Doug_E
Assuming the same aperture and effective focal length of the lens, if DOF the same for digital and film? I've not done a test, but my impression is that on my 20D f 4 is more like f8 on my 35mm film camera. I'm wondering if the sensor coverage factor makes a difference.
Yes, it does. Check out this Wikipedia link http://en.wikipedia.org/wiki/Depth_of_field for a good discussion of what's happening with your digital images versus the 35mm images.
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@ n5wd
Old 05-21-2006, 04:57 PM   #3 (permalink)
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Hey n5wd,

Great Link, Thanks for the info.
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Re: @ n5wd
Old 05-22-2006, 12:05 PM   #4 (permalink)
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Depth of field is purely a function of focal length, aperture and DISTANCE from the subject. It's the same for digital or film.

What you are probably seeing (or being confused by) is the "crop factor" that most pro-sumer digital cameras have. Let me try to explain...

If you fill the frame with your subject, say at 10 feet, with your lens and a film camera you have a certain depth of field at the aperture used. If you used your digital camera AT THE SAME DISTANCE, 10 feet, the dof would be the same.

So what would be different? Well thanks to the crop factor on most digital cameras, your subject would be a lot larger in the viewfinder with digital than with film. Meaning that if you position yourself (distance-wise) so that the image fills the same area of your viewfinder with digital as with film, you would be FURTHER AWAY from your subject. And since you are further away, you get a greater dof.

Does this help?
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Re: Depth of Field question
Old 05-24-2006, 04:47 PM   #5 (permalink)
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The mother of all DOF-related sites: http://www.dofmaster.com
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Re: Depth of Field question
Old 06-06-2006, 04:38 PM   #6 (permalink)
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So it seems that the 20D's sensor magnification factor plays with the DOF. Ah Ha.
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