Accurately comparing FF vs APS-C sensor performance? An open discussion.

Started Apr 8, 2013 | Discussions thread
OldClicker
Senior MemberPosts: 2,322
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Re: You misunderstand
In reply to VirtualMirage, Apr 10, 2013

VirtualMirage wrote:

OldClicker wrote:

DoF is perception.  Anything that changes the 'perceived' sharpness changes the DoF.

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Some would have you believe that having to adapt to new technology is a workaround, but having adapted to old technology is photography.

That is where I feel you are wrong.  Maybe it is just symantecs, but DoF is not perception.

DoF may affect our perception of sharpness, but DoF itself is not perceived. DoF is a measureable range in which an object appears sharp, aka in focus.

DoF is created by the optics, its relation and distance to the sensor, and the aperture setting.  It can be changed from shallow to deep based on these factors.

If DoF was just perception, then wouldn't the amount of DoF perceived change from person to person despite all the constants above being the same?

Since perception is based on an individual's experience, that means that it could appear differently to someone else.  But Dof doesn't work that way, it is measureable and can be changed precisely.

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Paul

DoF is a measureable range in which an object appears sharp...

Exactly and "appears"= perception.

If DoF was just perception, then wouldn't the amount of DoF perceived change from person to person despite all the constants above being the same?

Since perception is based on an individual's experience, that means that it could appear differently to someone else.

You can build a model by making assumptions about the size of the image, the distance viewed, the person's eyes, the light in the room, etc. (as DoF calculators do), but the actual DoF does change with all of these.

This doesn't mean that your comparisons using such a model are wrong as long as the underlying assumptions are correct for the discussion.  However if your model assumes that the pixel density/number of pixels has no affect on the, "measureable range in which an object appears sharp", and it actually does, then the model is wrong.

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Some would have you believe that having to adapt to new technology is a workaround, but having adapted to old technology is photography.

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