> Thomas Bantel wrote:
> I'm not talking about tweaking color, I'm talking resolution, film
> speed etc.
> While you can increase the "film speed" with a digital camera as
> well, you can't tweak resolution. You have to use what you have,
> which may or may not be enough.
Hi Thomas,
When looking at specifications of the D30 (and other cameras), I
was struck by the flexibility of the digital format:
1) Dynamic range could be increased over the native sensor range
by compositing bracketed exposures. Michael Reichmann describes
a related method using contrast masknig.
2) Noise can be reduced by dark frame subtraction (that the D30
does automatically for slow exposures), but can also by averaging
multiple frames. E.g. by averaging 8 frames, noise can be reduced
3 stops.
3) The native sensor resolution can be increased by compositing
or stitching several high resolution images of a narrower field
of view. The field of view can even be made 360 degrees or wider
by use of appropriate software.
4) One other advantage of digital that I did not see mentioned
is how lens spectral transmission characteristics take on lesser
importance. White balance not only removes colour cast from
lighting, but also from lens optics and coatings.
5) Along the same thinking, linear distortion properties (barrel
and pincushion) can be post-processed away. A perfect rectilinear
picture every time, even from the bottom of a wine bottle :-)
(or a circular fisheye for that matter).
6) And there are unexplored OPTICAL features that would only
be possible with the digital format. Imagine:
ELECTRONIC TILT function. If the sensor is SCANNED from top
to bottom as the lens focus is adjusted from near to far, it is
possible to have a tilted plane of focus. No digital camera
currently does this, but it is possible (but very tedious) to
do manually. Imagine making EVERY EF lens a tilt lens :-)
Cheers
Julian Loke
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