Jobo Time/Temps for FP-4, Tri-X, Delta 100?

[badbluesman]

I am looking for starting times to use for my own processing tests with Jobo Expert drums. I have been processing everything in X-Tol for years and love it, but I can easily extrapolate from D-76 or ID-11 times (other other developers).

Thanks in advance.

[Robert Ley]

Thishttp://www.digitaltruth.com/devchart.php is a great source for ballpark times for many developers and films.

Cheers,
Robert

[badbluesman]

That is a very handy chart, but they need to add a third parameter in which you would select "small tank," "large tank," "tray," or "rotary drum."

I just looked up my film-developer combo of the last 15 years: TMY 5x7 at ISO 250 with Xtol 1:1 at 24 degrees Celsius. They give a time of 10 minutes for roll films and do not give a time for sheet film. My sheet film time is 6 minutes for a Zone-perfect negative (when printed on Ilford with a grade 2.5 filter). So if I followed their 10 minute time I would have a very dense N+2 negative! They need to add rotary times to their spreadsheet. Rotary times are generally much shorter than tank or tray times because the agitation is continuous and pretty vigorous.

[Allen in Montreal]

Thishttp://www.digitaltruth.com/devchart.php is a great source for ballpark times for many developers and films.

Cheers,
Robert

Has anyone tried their iPhone app, which can be modified to one's personal development times?

[Allen in Montreal]

I am about to test my first box of FP4 too. (Ever, I have never shot the stuff and never thought I would see the day I did, or that I would have so much white in my fridge).

I shot some of the old (purple boxed) PXT tonight, I am down to my last 2 boxes,
that was a great film!
FP4 has a tough act to follow.

I am going to start the FP4 with D-76 1:1 125asa for 10 minutes at 68.
I will let you now how it goes, please post on how you progress with it too.


~~~~~

TXP 5x7 in D-76 1:1 Jobo 3006 at 68 degrees.

I had started to test the newer emulsion and found my N was 7 minutes at 250 asa.
I gave up on trying to buy 5x7 TXP locally and never followed the testing through to plus or minus times.

[badbluesman]

I last tested FP-4 in the early 90s. I wanted to try out the 5x7 format, so drove to Seattle from B.C. and rented a camera from Glazers. I picked up some 5x7 FP-4 because it was what they had in stock. I shot it at ISO 80 as I have found that most films work best with 2/3 stop more exposure than the manufacturer recommends. I did some comparison shots using both 4x5 and 5x7, changing the camera back and lens accordingly. I had the film processed by a Seattle lab using the large tank nitrogen burst method and then enlarged all of the negatives optically to 16x20. I found the quality to be superb in every way: tonality, sharpness, and grain (which was virtually invisible). The tones were as smooth as the proverbial baby's behind. I decided that FP-4 was a beautiful film, even though, at the time, it was more convenient for me to keep shooting a combination of T-Max 100 and T-Max 400 because they can be processed together and have a similar tonal quality. Now Ilford's lower prices have revived my interest in shooting FP-4.

[Bill_4606]

For every 10 people that answers your question, You'll probably get 12 answers ;-)

Here are the times I use for both a single and double reel tank:
FP-4 4x5 rated at IE 80, 68 degrees, slowest rotation speed, on Jobo CPA.
Stock D76 except for N--
Times are in minutes
N++ 18
N+ 13
N 10
N- 8
N-- 8 (1:1)

Good luck with your calibration -- Bill

[JON BUTLER]

Has anyone tried their iPhone app, which can be modified to one's personal development times?

Yes I use their App with all my times and and data programmed in and saved.
It's the best process timer I've ever used, used it since it came out, I wrap the phone in cling film when when using it in the darkroom.
JON

[badbluesman]

Thanks, Bill. Those look like good times. I can extrapolate for my Xtol developer and higher temp, etc.

Anyone have times for Tri-X in a Jobo? How about Delta 100?