Conclusion: Sensor size nor the number of pixels used to represent an image have anything to do with DoF........... True? In other words, it is the lens that makes the image, including DoF(assume apature is lens function). The camera determines the fidelity of what is captured.
I agree that sensor size and pixels affect resolution (the ability to see fine image detail, lp/mm whatever).
[a href=\"index.php?act=findpost&pid=135109\"][{POST_SNAPBACK}][/a]
Paul,
You'd find if you did a search that this subject has been debated ad nauseum on this forum many times.
There are other considerations that indirectly have an effect on the DoF of the final image, not just the mathematical furmulae relating to the lens aperture, focal length and distance to subject.
The most important of these is composition. You can make the statement that a 50mm lens on a cropped format camera produces the same DoF as a 50mm lens on a full frame camera, provided the aperture and distance to subject are the same, but he questions I would ask here are;
'Is an image without reference to its composition meaningful?'
'Is the statement that two
different compositions have the same DoF meaningful? The parts that are common to both images should have the same DoF, if the lens, aperture and distance to target is the same, but what about the parts that are
not common to both compositions?
Fine, you might say. With the cropped format camera, same lens and aperture, I'll just step back till the field of view is the same as that through the FF camera.
However, if you do so, the DoF will then be
greater.
Now some people will argue that the reason the DoF is greater is because you've increased the distance to the subject. And that's true. But there are often reasons behind reasons and I would argue that the reason why the distance is greater and therefore the DoF, in this example, is because I used a camera with a smaller sensor.