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02/03/2006 04:57:39 AM · #1 |
I was reading the forums at dpreview and some people there say this kind of stuff:
I bought myself a 5D because of the shallower depth of field.
It̢۪s not only 1 guy that has said this, I̢۪ve read it a few times more over there.
As far as I know, there is no difference between a 1.6x crop DSLR and a full frame DSLR DOF wise.
In my opinion the lens renders the dof depending on the apperature, this is then projected onto the sensor. it makes (to me, in my distorted mind) no difference if it is projected onto a 1.6x crop or FF using the same lens...(Only the crop is different)
Am I wrong? Did I miss something? Or did some people buy an expensive DSLR for the wrong reasons?
Here is an outtake of one of these posts:
'Preferred level of DoF'
If you are a 'bokeh-junkie' and like to shoot wide open, then the fullframe will render less DoF than the 1.6x, so then the fullframe has the advantage.
//forums.dpreview.com/forums/read.asp?forum=1010&message=17004493
Message edited by author 2006-02-03 05:00:56.
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02/03/2006 05:05:54 AM · #2 |
The DOF on the full frame sensor is the same DOF on the cropped sensor -- provided the image on the full frame sensor is sufficiently wider the image in the cropped portion is the same. If the same image is shown on both sensors, but full frame required a longer lens to achieve it -- and DOF decreases with length of lens. This difference is the what is being referred to when the lens are said to be the equivalent of a longer lens on a cropped sensor.
I hope I got the longers and biggers in the right places above and didn't confuse myself (or anyone else). :P
David
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02/03/2006 05:07:01 AM · #3 |
The short answer is that, yes, the DOF is less the larger the sensor size is.
If you're shooting a subject from the same distance with the same aperture and the same focal length with a 20D and a 5D, the lens behaves the same and the DOF is the same. However, the images are vastly different due to the crop factor of the 20D...you get more in the frame with the 5D.
If you want the same shot with the 5D, you're going to have to walk forward towards your subject, or zoom with your lens. Either way, you're now going to reduce the DOF quite dramatically for the same composition. DOF is a function of focal length, sensor size, aperture and distance to the focal plane. Reduce the focus distance and you get a narrower DOF. The effect is most dramatically seen in macro shots.
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02/03/2006 05:26:19 AM · #4 |
| This article explains it quite well |
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02/03/2006 06:17:48 AM · #5 |
Okidoki, well explained. See I learn everyday ;)
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