[Leica] DMR test in British Journal of Photography

[frank.dernie at btinternet.com (FRANK DERNIE)]

I am by no means an expert on digital optical systems
but in digital data logging systems lack of an anti
aliasing filter results in spurious in band data being
recorded if there is -any- information above 1/2 the
sampling frequency. Does anybody on the list know how
the software anti aliasing works? AFAIK it is
impossible to separate the spurious from real once the
data is in the digital domain. Perhaps the software is
just concealing artifacts rather than eliminating
them?
If the resolution of the lens is low enough, or, say,
a hand held picture had a small amount of shake, there
may be no artifacts because the image focussed on the
sensor by the lens won't have enough resolution to
cause aliasing anyway.
I would imagine that the users in the discussion group
and the testers are both right. Probably, since few
people use their lenses to their highest potential,
the artifacts will not be present for most users.
Those who use the highest resolution lenses on a
tripod will certainly experience aliasing, the
question is, will it be noticeable in normal use and
can the software eliminate of adequately disguise it.
Frank


--- Rick Dykstra <rdcb37@dodo.com.au> wrote:

> It looks like the reviewer hasn't been reading the
> Fred Miranda DMR  
> thread.  ;-)
>