D800 and narrow depth-of-field?

Started Jun 3, 2012 | Discussions thread
bobn2
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Re: D800 and narrow depth-of-field?
In reply to carlk, Aug 19, 2012

carlk wrote:

bobn2 wrote:

John Motts wrote:

carlk wrote:

bobn2 wrote:

Or perhaps op was looking at 100% which will make D800 much larger

hard to judge - if you view 100%, all the sensible references around which the DOF concept is built disappear.
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Bob

Not true. There is nothing special about 100%. You are just enlarging the image, or not reducing the image, when you view 100%.

Yes but you are enlarging the image a great deal more when looking at a D800.

Exactly, it leads you to do DOF comparisons between different size images, so the magnification factor is different in the formulae for each camera.

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Bob

Yes and the DOF caculator people are using, and most camera/lens manufacturers are quoting, are using 8x10 print as the reference I believe.

This confusion is one reason I much prefer harold Merklinger's idea of doing DOF calculations in the object field rather than the image field . Its much easier, i find, to conceptualise in terms of how large details in your subject that you want to resolve (or how big you want to blur them) and then the whole issue of print size, sensor size and so on disappears.
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Bob

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