Re: [photo-3d] roll curl

[Paul Talbot <list_post@xxxxxxxxx>]

"Dr. George A. Themelis" wrote:
> 
> It depends on how tight you reverse the roll.
> One day is usually safe.  One week will definitely
> leave a reverse curl, HOWEVER, you can always
> reverse the reverse curl and eliminate it!!!!!

The problem is that the middle section of the film
will flatten fairly easily (or apparently so) with
reverse and reverse-reverse rolling, but the ends do
not flatten easily.  I've also found that a roll
that looked fairly flat before cutting was not in
fact flat enough for easy mounting after cutting.
When an almost-flat roll of film is laid on the floor
or a long table, the weight of the ends of rolls may
be pulling the center portions of the roll down flat
against the surface.  But a single 5P piece cut from
the center of the roll doesn't have all that weight
pulling it down, so it may curl after cutting.

It does make a big difference how the film was rolled
by the processor.  If the film is rolled with a a two-inch
diameter center, reverse rolling can be pretty easy.  If
it is rolled so as to fit back inside the film cannister,
it will be a nightmare to flatten!

But I still strongly recommend the approach of picking
the film up flat from the processor.

As an aside, I much prefer a local processor I've found
who uses *clean* machine processing over one who uses
dip-and-dunk.  With dip-and-dunk you get a "hairpin curve"
bend in the middle of the roll (where the film hung on
a bar to be dipped and dunked in the chemicals).  The
bend is even a bigger nightmare to fix than the whole roll
curl--but at least it only affects one frame.

Paul Talbot