Hi Elias -
The film recorder is the hardware which "projects" the image for
shooting... it is a very high grade proprietary CRT mated to a film
camera. The resolution of the projection system is matched to the film
format used for output. Here's an explanation of the math:
http://www.modernimaging.com/film_recorders.htm
It's an old article and modern recorders are capable of significantly
higher resolution, though in truth few projection applications require
it.
While it is true that MF projection may have an edge over high-end
digital projection in terms of resolution, it is much for expensive,
much less reliable, and does not provide the production options of
digital projection technology. I have not seen a commercial or
corporate projected conference presentation with film in years... the
industry has moved to digital to match customer demands.
If you ever have the chance to attend an NSA or ISU conferences, you
will see stereo digital and film projection (very demanding
applications) in 35 mm and MF. You can judge for yourself the current
state of the art for each medium; these folks have been moving more
and more to digital projection for the reasons we've been discussing.
Eric Goldstein
--
On Mon, Oct 12, 2009 at 5:49 PM, <eroustom@xxxxxxxxxxx> wrote:
From what I've read - it seems that the way the digital file is
transferred to slides is by projecting the digital image onto a
roll of slide film and then processing it (E6). So what you have is
a slide to project that is itself a 600x900 pixel image. 900 pixels
over 36mm is 25 pixels per 1mm (pretty good) which projected to 1
meter wide (in my classroom) would spread those 25 pixels across
40mm, and from 2-3 meters away, nobody is going to see them. I
suppose that enlarging it to something like 2 meters wide you would
see it. Some of the services offer higher resolution output for
around $4 a slide... at that price I'll reshoot. But at $2 a slide
for what I was missing from my lecture, 600x900 will do just fine.
Thanks Mark and Eric for sharing your confidence with the process.
John, I'm surprised that your scan did so poorly when projected
digitally. I had a friend give a lecture to my class last fall, and
he hooked up his laptop to the department's projector and what we
saw looked pretty good to me. I probably didn't notice the pixels
so much, as it was a typography lecture, and I'm used to seeing
type on screen. All his images were either scans of flat art (b&w
line art) or point-and-shoot digital captures from his notebooks.
Elias
----- Original Message -----
From: "John Wild" <jwild@xxxxxxxxxxxxxxxxxxxxxx>
To: "rollei list" <rollei_list@xxxxxxxxxxxxx>
Sent: Monday, October 12, 2009 3:58:15 AM GMT -05:00 US/Canada
Eastern
Subject: [rollei_list] Re: OT: 35mm Slides from Digital Images
A 'real' slide show, especially with 6x6 transparencies is way, way
better
than a digital projector can produce.
I did a comparison with a 6x6 transparency and a scanned file of that
transparency, both projected side by side to about 4 feet square. The
digital projector image was pixelated and the colours and contrast
range
were not a patch on the slide. The Digital image was brighter though.
Digital projectors only have limited resolution on similar to a
computer
monitor resolution, ie VGA, SVGA, EGA etc so it does not matter how
fine the
resolution of the digital file is, the projectors cannot display
that amount
of detail.
Printing a digital file to produce a transparency may be a better
option but
again the resolution of the printer used to produce the image will
have a
bearing on the maximum projected size when compared to a film
transparency.
You may get better results by printing the digital file onto paper
and
photographing the paper onto transparency film.
John
On 11/10/2009 15:46, "Robert Meier" <robertmeier@xxxxxxxxx> wrote:
My experience is the opposite: slides in a slide projector give a
brighter, sharper, and more colorful image than digital projectors
give. By far.
On Oct 11, 2009, at 8:48 AM, Elias Roustom wrote:
This is OT for sure, but there's some very experienced pros on this
list.
I gave a slide presentation to my class the other day, and was
sorry I wasn't able to include some digital shots.
(I should have kept up the strict analog regimen) Has anyone ever
made slides from digital files? Any advise, or warnings?
I know digital projection is supposed to be superior in every way,
but my slide projector is bought and paid for, and even if I borrow
a projector from the department I don't have a laptop to work from,
and I doubt the iPod route is good enough.
Thanks,
Elias
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