RE: [Leica] Exposing TMAX 400 vs Tri-X

["Bob Gibson" <retail.shops@stonebow.otago.ac.nz>]

Hi Peter
Regarding the curve.
Without getting into too much detail the curve is a plot of image densities.
It is sort of a bit S shaped. The bottom or toe shows the base density of
film, as you progress up the curve you get to the area where shadow detail
is recorded and then onto the midtones which tend to be in a more straight
line part of the curve. The top of the  curve starts to flatten out and this
is the highlight area.
You use this sensotometry info to evaluate film/developer/subject
combinations.
I can go into more detail if required.
Regards
Bob

- -----Original Message-----
From: owner-leica-users@mejac.palo-alto.ca.us
[mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of Peter Shier
Sent: Thursday, November 09, 2000 7:02 AM
To: leica-users@mejac.palo-alto.ca.us
Subject: RE: [Leica] Exposing TMAX 400 vs Tri-X


So do you always shoot TMAX 400 at 320?

What about TMAX 100?. I gave the same lab a roll of 120 TMAX 100 along with
that test and it was fine.

Could you explain the curve stuff to a novice?

Peter

- -----Original Message-----
From: owner-leica-users@mejac.palo-alto.ca.us
[mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of Mark
Rabiner
Sent: Wednesday, November 08, 2000 12:23 PM
To: leica-users@mejac.palo-alto.ca.us
Subject: Re: [Leica] Exposing TMAX 400 vs Tri-X

IMO (and i know others differ) aikod Tri x has a real speed in most
developers
of 400.
T Max 400 IMO opinion and experience and the shooters I know in town has a
real
speed of 320.
A half stop slower than tri x of real speed.

Also the curve shapes different and could be part of the issue.
Tri x has a higher toe than T. Max which drops off (down) quicker.


mark rabiner