>
>
> William Robb wrote:
> > With digital capture, there is no resolution loss when subject contrast
> > drops, unlike film..
>
> John Francis wrote:
> > In real life, of course, most patterns are lower-contrast
> > than all black/all white, so deliver lower than theoretical
> > maximum resolut
William Robb wrote:
> With digital capture, there is no resolution loss when subject contrast
> drops, unlike film..
John Francis wrote:
> In real life, of course, most patterns are lower-contrast
> than all black/all white, so deliver lower than theoretical
> maximum resolution. But they tend t
Thanks, John.
Very interesting.
Jostein
Quoting John Francis <[EMAIL PROTECTED]>:
> >
> > John, (or Rob or anyone...)
> > This may be a stupid question, but is the relationship between lp/mm and
> > sensors as straightforward as "two adjacent sensors equal to one line
> pair,
> > irrespective of
>
> John, (or Rob or anyone...)
> This may be a stupid question, but is the relationship between lp/mm and
> sensors as straightforward as "two adjacent sensors equal to one line pair,
> irrespective of sensor colour"?
Not quite, because the sensor colour does enter into it.
But if your stimulus
- Original Message -
From: "Jens Bladt"
Subject: RE: *ist D resolution (was:Soon to be new istD owners)
with 35mm film.
>
> Simple math tels me that 3000 pixel covering 24mm gives 125 pixel/mm. But
> you need three to make a PAIR of lines. Gives you appr. 43 line pa
- Original Message -
From: John Francis replying to Jens Bladt
> >
> > Simple math tels me that 3000 pixel covering 24mm gives 125 pixel/mm.
But
> > you need three to make a PAIR of lines.
>
> Sigh. Here we go again.
>
> You need two pixels (one black, one white) to make a pair of lines
>
>
> Simple math tels me that 3000 pixel covering 24mm gives 125 pixel/mm. But
> you need three to make a PAIR of lines.
Sigh. Here we go again.
You need two pixels (one black, one white) to make a pair of lines
(also one black, one white). So 3000 pixels in 24mm is 62.5 lp/mm.
On 12 Jan 2004 at 22:28, Jens Bladt wrote:
> Hi Rob
> Hmmm. Not so sure about how to test lens resolution on film.
> I'm sure 100 linepairs pr. mm has been occationally achieved on film.
Hi Jens,
Plenty of resources here: http://members.ozemail.com.au/~distudio/lenstesting/
> Simple math tels m
Hi Rob
Hmmm. Not so sure about how to test lens resolution on film.
I'm sure 100 linepairs pr. mm has been occationally achieved on film. In
those days the lenses was often setting the limmits. As opposed to todays
technology where the CCD are setting the limits. Hav you ever seen digital
images bl
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