Interpolation out is free — you can make files of any size from any initial
size - even 1x1.
If you want comparable image quality, the best lenses on a Nikon d810 would be
sharper than your mamiya 6x7 at
f/2 to f/8. the 6x7 (or larger) would be sharper at narrower apertures because
diffraction affects the larger images
less. However, for the smaller image capture, there is more depth of field at
all apertures - and less light needed.
See also http://www.luminous-landscape.com/reviews/shootout.shtml (2003 - f/8)
http://www.luminous-landscape.com/essays/Cramer.shtml (2006 mf digital vs. 4x5
film)
http://www.markcassino.com/b2evolution/index.php/digital-slr-vs-medium-format-updated-ima
(2009 - f/16) mf was a prime, digital was a zoom …
http://acameradiary.blogspot.ca/2013/12/field-comparison-medium-format-vs.html
And, of course, there is stitching multiple photos together for even more
resolution as well as no grain - but tilt and
shift are more limited than some film cameras.
Digital also has the possibility in the future of changing sensor configuration
(eg 3d-curved or "light field" or
multiples) to improve, or calculating sharper lenses with known defects which
can be corrected by math - in the
camera or later This is already being done for existing defects in common
lenses in modern cameras for their JPG.
Film, on the other hand, does not have the same R&D expenditures these days....
Digital sensors have the advantage of no grain and steadily improving dynamic
range and resolution.
Image sensors and film have not been the resolution limitation for quite a
while. Lenses and diffraction are.
Large formats or large apertures are the only way to avoid diffraction softness.
tOM
2014 Nov 02 - Sun at 12:27 re:[OM] Mega Pixel equivalent of mediu …
John Hudson <olympus@xxxxxxxxxxxxxxxxx>wrote
>Here is a question attributable to just mild curiosity.
>
>I have scanned several 6 x 7 colour negatives taken with a Mamiya 7 II
>medium format rangefinder.
>
>At the most extreme size, some of the 16 bit/ch TIFF files are 528,000
>kb each.
>
>If one wanted to generate a similarly sized TIFF file from a digital raw
>file what would the megapixel rating have to be of the camera ?
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