I think John Hart addressed this recently (maybe on Photo3d) but I
can't find the post. I was thinking of trying the slide service from
www.slides.com to transfer digital to medium format. My own
experiments with digital slides showed a significant difference in
quality between 1.4MP, 2.1MP and 8.0MP files transferred to MF3D. Is
there any significant difference in sharpness if the file is 12MP? How
good are 5MP files?

Sam

I'd email the folks at slides.com, ask the resolution & ICC profile of
their film printer, and then target those values. (It would be great
if you posted the values to the MF3D group as well.)

On Mon, Mar 24, 2008 at 7:21 PM, Sam Smith <groups@stereoscopia.com> wrote:
>
>
>
>
>
>
> I think John Hart addressed this recently (maybe on Photo3d) but I
> can't find the post. I was thinking of trying the slide service from
> www.slides.com to transfer digital to medium format. My own
> experiments with digital slides showed a significant difference in
> quality between 1.4MP, 2.1MP and 8.0MP files transferred to MF3D. Is
> there any significant difference in sharpness if the file is 12MP? How
> good are 5MP files?
>
> Sam
>
>



--
When we remember we are all mad, the mysteries disappear and life
stands explained.
- Mark Twain

--- In MF3D-group@yahoogroups.com, "Sam Smith" wrote:

> experiments with digital slides showed a significant difference in
> quality between 1.4MP, 2.1MP and 8.0MP files transferred to MF3D. Is
> there any significant difference in sharpness if the file is 12MP? How
> good are 5MP files?

In my experience, 5MP won't cut it to MF's that are being viewed with
the 3DWorld (pretty high mag) viewer. 7MP is marginal depending on
subject matter (e.g. works OK for simple full frontal object with no
fine low contrast texture detail, etc.). Good quality 12MP images will
work better. I send mostly 16MP+.

I don't think you learn much from film-recorder specs and the like.
There are just too many steps in the process. Someone should make up a
digital test file (1000 dpcm say, or 5200x5200), with a color chart and
a resolution pattern and send it to the labs that make MF's. I have
tried two labs with ordinary images: slides.com and gammatech.com .
Slides.com used grainier 70mm agfa film while gammatech used 120-E100
and had slightly better color (and maybe a bit better rez, though
subtle). But gammatech is $20 per pair vs. $10. It's quite possible
one could work iterations with these people, but I was in a hurry to
get stuff for a show.

HTH, John