At what size of print out of D700 will show the same quality as that of D600.

Started Mar 7, 2014 | Discussions thread
Rick Knepper Forum Pro • Posts: 14,542
Not every 4mb file is equal - that's where your analysis fails.

ebuddha wrote:

great question - most people have way too much resolution for their needs.

a 30" monitor only requires a 4MB file to fill it up.
an ipad only requires 3MB.

Required print resolution is a function of viewing distance.
One thought is that comfortable viewing is 1.5x the diagonal.
Then, the PPI required for a print to have 'minimum acceptable quality' is found using this formula:
PPI = 3438 / viewing distance

As an example, an 8" x 10" print has a diagonal of 12.8"
and thus a viewing distance of 19.2"
The minimum PPI required would be: 179 - which is only a 2.6MB file.

Personally, I prefer using 1x the diagonal in the formula, which implies a minimum PPI for an 8x10 to be: 269. That would mean a 6MB file is sufficient.

As far as using the number 3438, you can look this up online, it has something to do with "visual acuity angle, a measure of how much resolution the human visual system can perceive"

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Rick Knepper, photographer, shooting for pleasure. It is better to have It and not need It than need It and not have It. Various RAW comparisons at Link. Includes 5D3 vs D800E, 5D3 vs. 6D, Zeiss lenses etc.

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