Tri-X 400 @ 1600 in Rodinal Special?

Does anybody have experience with Tri-X 400 @ 1600 in Rodinal Special?
6 minutes at 20 C works fine for film exposed at 400.
Peter

email a - b

The ISO speed of Tri-X is 400. The actual usable speed is about 250.
You're going the wrong direction.

The ISO speed of Tri-X is 400. The actual usable speed is about 250.
You're going the wrong direction.

Wrong direction?
Not if he is working under low lighting conditions.
See http://www.tom-elliott-photography.com/special.htm
All tri-x @ 1,000 asa in D-23 1:1 - 65F (forgot the time) with minimal
agatiation of 4 times during the time period. Basically a "still"
development process. You definately had to do the minimal agitaions or you
would get development streaks caused by the silver gravitating to the bottom
of the tank. Thin flat negs, even though pushed, but worked great for my
paper (agfa brovira) enlarger (Omega DII) combination. I also experimented
with my own homebuilt point sourse adaptor.
Have fun,
Tom
wrote in message
ups.com...
The ISO speed of Tri-X is 400. The actual usable speed is about 250.
You're going the wrong direction.

Alas the best way to deal with the troll is to ignore him.

Tom Ellliott wrote:
: Wrong direction?
: Not if he is working under low lighting conditions.
: See http://www.tom-elliott-photography.com/special.htm
: All tri-x @ 1,000 asa in D-23 1:1 - 65F (forgot the time) with minimal
: agatiation of 4 times during the time period. Basically a "still"
: development process. You definately had to do the minimal agitaions or you
: would get development streaks caused by the silver gravitating to the bottom
: of the tank. Thin flat negs, even though pushed, but worked great for my
: paper (agfa brovira) enlarger (Omega DII) combination. I also experimented
: with my own homebuilt point sourse adaptor.
: Have fun,
: Tom



--




Keep working millions on welfare depend on you
-------------------

I used few times tri-x 400@1600 in d-23 1+1 20C
(17-18 minutes afair) and was also quite satisfied.

marcin

U¿ytkownik "Tom Ellliott" napisa³ w wiadomo¶ci
...
Wrong direction?
Not if he is working under low lighting conditions.
See http://www.tom-elliott-photography.com/special.htm
All tri-x @ 1,000 asa in D-23 1:1 - 65F (forgot the time) with
minimal
agatiation of 4 times during the time period. Basically a "still"
development process. You definately had to do the minimal agitaions
or you
would get development streaks caused by the silver gravitating to
the bottom
of the tank. Thin flat negs, even though pushed, but worked great
for my
paper (agfa brovira) enlarger (Omega DII) combination. I also
experimented
with my own homebuilt point sourse adaptor.
Have fun,
Tom
wrote in message
ups.com...
The ISO speed of Tri-X is 400. The actual usable speed is about
250.
You're going the wrong direction.

That's right. ISO ratings are too high. You need to cut them by 1/3 or
so.

wrote in message
oups.com...
Does anybody have experience with Tri-X 400 @ 1600 in
Rodinal Special?
6 minutes at 20 C works fine for film exposed at 400.
Peter

email a - b


I don't have specific info about Rodinal Special but a two
stop push for most film/developer combinations requires
about double the developing time for normal contrast for
diffusion printing.
Remember that you are not really increasing the speed of
the film, only its contrast. Since underexposure is mostly
on the "toe" of the film curve, where contrast is lower than
for the rest of the curve, increasing contrast by push
developing will help to make this area printable.
2 stops push from the ISO speed is just about the limit
of sensitivity for most films. If the scenes have any
contrast the negatives will be hard to print because any
exposure beyond the toe of the film will be of very high
contrast. This will be true for any developer or film.
Underexposure much below about 2 stops will simply not
record on the film so no amount of development increase can
bring it out. My experience with Tri-X 400 is that around
EI-1000 is the limit if tonal rendition is to be reasonably
good.

If you have used Rodinal Special please post _your_
experiences with it. I am not even sure its available in the
US. It is NOT the same thing as Rodinal and appears to use a
unique developing agent. I am curious about it.


--
---
Richard Knoppow
Los Angeles, CA, USA

wrote in message
oups.com...
Does anybody have experience with Tri-X 400 @ 1600 in
Rodinal Special?
6 minutes at 20 C works fine for film exposed at 400.
Peter

email a - b


I don't have specific info about Rodinal Special but a two
stop push for most film/developer combinations requires
about double the developing time for normal contrast for
diffusion printing.
Remember that you are not really increasing the speed of
the film, only its contrast. Since underexposure is mostly
on the "toe" of the film curve, where contrast is lower than
for the rest of the curve, increasing contrast by push
developing will help to make this area printable.
2 stops push from the ISO speed is just about the limit
of sensitivity for most films. If the scenes have any
contrast the negatives will be hard to print because any
exposure beyond the toe of the film will be of very high
contrast. This will be true for any developer or film.
Underexposure much below about 2 stops will simply not
record on the film so no amount of development increase can
bring it out. My experience with Tri-X 400 is that around
EI-1000 is the limit if tonal rendition is to be reasonably
good.

If you have used Rodinal Special please post _your_
experiences with it. I am not even sure its available in the
US. It is NOT the same thing as Rodinal and appears to use a
unique developing agent. I am curious about it.


--
---
Richard Knoppow
Los Angeles, CA, USA

Richard Knoppow wrote:
wrote in message
oups.com...
Does anybody have experience with Tri-X 400 @ 1600 in
Rodinal Special?
6 minutes at 20 C works fine for film exposed at 400.

If you have used Rodinal Special please post _your_
experiences with it. I am not even sure its available in the
US. It is NOT the same thing as Rodinal and appears to use a
unique developing agent. I am curious about it.

I've heard in the US Rodinal Special is called Studional.
According to the Rodinal special instructions Tri-x 6 minutes at 20 C,
dilution 1+15.
According to the Tri-X package for several developers exposed @ 1600
the develop-time multiplies by 1.5
Further I found recommendations to dilute the developer more when a
film is pushed.
So I tried the following: Rodinal Special 1+45 (3x6) x 1.5 = 27 minutes

So Tri-x 400 @ 1600 at 20 C for 27 minutes, Rodinal Special 1 + 45,
result was grainy, but ok, example at:
http://torino.ict.hva.nl/images/conc...eimaand1_7.jpg
Equipment: Minolta 7000i + 50mm 1.7 (I think it was 1/60 @ 4)

Peter