"Roba Apposta": reversal process for film and paper

[mammolo]

Hi everybody,
I just completed the profiling of a couple of widely available papers (Ilford MG RC and FB) used in-camera and then inverted using “Roba Apposta” by Branco Ottico, an Italian company. “Roba Apposta” is a reversal development process sold as a kit that works for both film and paper. I used it only with paper.

I wrote a paper on this profiling. Here is the link:
https://www.marcoannaratone.photography/Tests-(PDFs)/thumbs

I included below an example from a project I just started (“Syringes”). It’s a 14x17in cut from 16x20 and used inside my Lotus ULF camera. G-Claron 355mm @ f/45.5

I have no relationship with Branco Ottico so I suggest you have a look at their site if interested:

http://www.brancoottico.fineartlabo.com

Cheers!

 

[Peter Schrager]

Marco thank you for the in-depth write up
I also enjoyed your other writing/musings
very thoughtful and left me thinking!!
Peter

 

[mammolo]

Marco thank you for the in-depth write up
I also enjoyed your other writing/musings
very thoughtful and left me thinking!!
Peter

Hi Peter,

thank you for the kind words! Many years ago (too many...) a lot of people invested their time in forums like this one to bring me up to speed re: large format photography. When I have something to share I think it is a bit my obligation now to return the favor.

Cheers!

 

[Raghu Kuvempunagar]

Very nice and detailed writeup! I had a great time last year in the midst of covid crisis making in-camera reversal prints. Some of my exposures at EI 3 were long running into several minutes and reciprocity was a major concern. Did you do any testing with exposures that ran into reciprocity failure? Are there correction factors that you found from your testing that you can share?

 

[mammolo]

My longest exposure was two minutes and I did not have to introduce any correction to account for reciprocity failure. But I believe this applies to the specific papers I use (someone should correct me if I am wrong), i.e., Ilford MG RC and FB. Another paper may exhibit reciprocity failures much sooner (or later).