Den 1. okt. 2005 kl. 16.34 skrev Rob Studdert:
On 1 Oct 2005 at 16:16, DagT wrote:
You still dont get it. The oversampling is good for removing
information that the algorithms put there because they give frequency
components that results from the pixel pitch.
I would expect that with increased sensor density the manufacturer
would simply
provide a matched diffusion filter which effectively cuts off spatial
frequencies just above the sensors Nyquist frequency. Over-sampling
in a simple
non-TD system with a matched LPF really makes no sense.
It does if you can avoid or reduce the diffusing.
Yes, they do filter the sensor optically (diffusing) but more pixels
may be better because you get better contrast. They may still do this
on a 10MP sensor because some lenses has enough resolution to need
it, but not to the same extent. This is, by the way, one of the
reasons why digital lenses need other qualities than resolution. To
some degree resolution make problems.
Better contrast simply translates to higher recorded spatial
frequencies or
resolution, which as Herb suggested will be lost on a poor
performing lens.
No, the Fourier transform does not generate new frequencies when you
only vary the amplitude.
Digital lenses are marketing hype, most lenses that perform well on
film will
perform well in a direct digital capture system.
Most, maybe, but especially the wide angles need special considerations.
DagT
