Dredging out of my memory of film things, Tri-X Pan was the standard,
normal, consumer film you found in most photo stores. Tri-X
Professional had a softer gamma curve with a longer toe region.
They're similar but different emulsions.
Godfrey
On Jun 24, 2005, at 4:34 PM, Don Sanderson wrote:
I see Tri-X packaged as "Tri-X Pan" and "Tri-X Professional".
I assumed there was no real difference as I've also seen it
advertised as Pro when the package said Pan and the other
way around.
Talking strictly about the ISO 400 flavor here.
Kodak only lists the Pro on their web site as near as I can tell.
Here's the rub: The Pan version data sheet says 8 minutes at
68 degrees F in D-76 while the Pro version calls for 6 3/4
minutes at 68, also in D-76. Both at 1:1.
Here's a link to the D-76 data sheet that shows 4 flavors of Tri-X
at 3 different development times at 68 degrees:
http://tinyurl.com/89frp
Does anyone have the answer to this riddle?
Why the rather large difference in soup times?
TIA
Don
