A Simple Processing Of Color Negs?

Is there a simple way to process color negs without investing in a Jobo or
other moderately expensive system? How critical is controlled development
anyway? Cannot shifts in colors be compensated in the enlarger by a turn of
the knob? Or on the scanner with a tweak of the histogram? Thx.

Alan Smithee wrote:
Is there a simple way to process color negs without investing in a
Jobo or
other moderately expensive system? How critical is controlled
development
anyway? Cannot shifts in colors be compensated in the enlarger by a
turn of
the knob? Or on the scanner with a tweak of the histogram? Thx.

Color processing of every kind requires tight temperature and timing
control.

In other words, NO!

Alan Smithee wrote:
Is there a simple way to process color negs without investing in a
Jobo or
other moderately expensive system? How critical is controlled
development
anyway? Cannot shifts in colors be compensated in the enlarger by a
turn of
the knob? Or on the scanner with a tweak of the histogram? Thx.

Color processing of every kind requires tight temperature and timing
control.

In other words, NO!

In article %gW1e.829905$6l.469523@pd7tw2no,
"Alan Smithee" wrote:

Is there a simple way to process color negs without investing in a Jobo or
other moderately expensive system? How critical is controlled development
anyway? Cannot shifts in colors be compensated in the enlarger by a turn of
the knob? Or on the scanner with a tweak of the histogram? Thx.

Tetenal makes a room temp C41. Past a certain point you don't want the
film to be outside the process. C41 is a little more forgiving than E6
regarding this but shifted colors are problematic in either scans or
direct optical prints. I would stay within the suggested guidelines,
also my belief is that the more complex kits give better results over
all.

--
LF Website @ http://members.verizon.net/~gregoryblank

"To announce that there must be no criticism of the President,
or that we are to stand by the President, right or wrong,
is not only unpatriotic and servile, but is morally treasonable
to the American public."--Theodore Roosevelt, May 7, 1918

In article %gW1e.829905$6l.469523@pd7tw2no,
"Alan Smithee" wrote:

Is there a simple way to process color negs without investing in a Jobo or
other moderately expensive system? How critical is controlled development
anyway? Cannot shifts in colors be compensated in the enlarger by a turn of
the knob? Or on the scanner with a tweak of the histogram? Thx.

Tetenal makes a room temp C41. Past a certain point you don't want the
film to be outside the process. C41 is a little more forgiving than E6
regarding this but shifted colors are problematic in either scans or
direct optical prints. I would stay within the suggested guidelines,
also my belief is that the more complex kits give better results over
all.

--
LF Website @ http://members.verizon.net/~gregoryblank

"To announce that there must be no criticism of the President,
or that we are to stand by the President, right or wrong,
is not only unpatriotic and servile, but is morally treasonable
to the American public."--Theodore Roosevelt, May 7, 1918

Alan Smithee wrote:
Is there a simple way to process color negs without investing in a Jobo or
other moderately expensive system? How critical is controlled development
anyway? Cannot shifts in colors be compensated in the enlarger by a turn of
the knob? Or on the scanner with a tweak of the histogram? Thx.


You can process color negatives (and even E-6) in a stainless steel
tank. I did E-6 once and it worked out just fine. But you must pay
attention to the times and temperatures. I did it just once, in a
photography class in the early 1970s, but it probably would work today.

You use a water bath to maintain the temperature. The first time, you
mix up 100%water and 0% chemicals for each component of the chemistry.
You fill a dishpan or something with hot water somewhat over the process
temperature you must use.

Then when the chemicals are at the right temperature (perhaps 4 degrees
over the desired processing temperature), you run the process and
measure the (first) developer temperature after the development step,
and the fix temperature after the fix (or blix) step. If the developer
temperature is the same number of degrees under the desired process
temper as it was before, you used the correct starting temperature.
If the fix temperature is withing the range specified by the chemistry
manufacturer, all is OK.

You might want to do this a few times to make sure the temperatures are
under control. Then do it with real film and properly mixed chemistry.

It will work, but if you do more than a few rolls a year, you may wish
to get something like a Jobo CPE (or larger) processor. If you do not
need to process many rolls of film, perhaps you should just find a good
color lab.

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ PGP-Key: 9A2FC99A Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 11:40:00 up 3 days, 1:56, 3 users, load average: 4.18, 4.14, 4.10

Alan Smithee wrote:
Is there a simple way to process color negs without investing in a Jobo or

Sure. Use a water bath. The Jobo tanks hold temp pretty well and C-41
times are short. The critical one is the developer which is 3:15. Warm the
tank before you start by standing it in the water bath. Add chemicals at the
right temp and you're fine. The rest of the steps have fairly wide temp
ranges. If you use the Jobo tanks on a roller base then you've got agitation
taken care of also. Plug the motorbase into a timer and you've got your
timing looked after.

Nick

Nick Zentena wrote:
Alan Smithee wrote:
Is there a simple way to process color negs without investing in a Jobo or

Sure. Use a water bath. The Jobo tanks hold temp pretty well and C-41
times are short. The critical one is the developer which is 3:15. Warm the
tank before you start by standing it in the water bath. Add chemicals at the
right temp and you're fine. The rest of the steps have fairly wide temp
ranges. If you use the Jobo tanks on a roller base then you've got agitation
taken care of also. Plug the motorbase into a timer and you've got your
timing looked after.


BTW I mean use the water bath to stand the chemicals in. Not to put the
motorbase in-))

Nick

Nick Zentena wrote:
Alan Smithee wrote:
Is there a simple way to process color negs without investing in a
Jobo or

Sure. Use a water bath. The Jobo tanks hold temp pretty well and
C-41 times are short. The critical one is the developer which is
3:15. Warm the tank before you start by standing it in the water
bath. Add chemicals at the right temp and you're fine. The rest of
the steps have fairly wide temp ranges. If you use the Jobo tanks on
a roller base then you've got agitation taken care of also. Plug the
motorbase into a timer and you've got your timing looked after.

Nick

This sounds reasonable. Thanks.

Jean-David Beyer wrote:
Alan Smithee wrote:
Is there a simple way to process color negs without investing in a
Jobo or other moderately expensive system? How critical is
controlled development anyway? Cannot shifts in colors be
compensated in the enlarger by a turn of the knob? Or on the scanner
with a tweak of the histogram? Thx.


You can process color negatives (and even E-6) in a stainless steel
tank. I did E-6 once and it worked out just fine. But you must pay
attention to the times and temperatures. I did it just once, in a
photography class in the early 1970s, but it probably would work
today.

You use a water bath to maintain the temperature. The first time, you
mix up 100%water and 0% chemicals for each component of the chemistry.
You fill a dishpan or something with hot water somewhat over the
process temperature you must use.

Then when the chemicals are at the right temperature (perhaps 4
degrees over the desired processing temperature), you run the process
and measure the (first) developer temperature after the development
step, and the fix temperature after the fix (or blix) step. If the
developer temperature is the same number of degrees under the desired
process temper as it was before, you used the correct starting
temperature.
If the fix temperature is withing the range specified by the chemistry
manufacturer, all is OK.

You might want to do this a few times to make sure the temperatures
are under control. Then do it with real film and properly mixed
chemistry.

It will work, but if you do more than a few rolls a year, you may wish
to get something like a Jobo CPE (or larger) processor. If you do not
need to process many rolls of film, perhaps you should just find a
good color lab.

Thank you.