Sensor Size does not dictate DOF ...

Started Dec 3, 2012 | Discussions thread
antoineb Veteran Member • Posts: 6,624
sensor size and pixel density ARE parameters in the equation

I'm not sure what you mean.  DOF, and diffraction, are governed by multiple parameters.  Sensor size is one parameter in both of these.  And pixel density is a parameter in whether and how soon you see diffraction.

Saying, like you do, that they don't "dictate", is pretty meaningless to me.

It's as if you said, "the weight of a car does not dictate its acceleration".  The weight, actually the mass, of a car, is one parameter in the equation that gives its acceleration.  Other parameters would typically be engine power and power curve, efficiency of mechanical transmission, friction coefficient between road and tyre, etc.

What IS true though:

- all else being equal, a larger sensor will give shallower DOF.  You can play with various on-line DOF calculators to convince yourself

- all else being equal, the denser your pixels the sooner you will see the effects of diffraction in your image.  Diffraction isn't at all PRODUCED by a higher pixel density - but the higher pixel density is able to show you the adverse effects of diffraction on your image, sooner

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