Two Rollei Ortho Emulsions Available

[2F/2F]

Can anyone comment on the differences between Rollei Ortho 25 and Rollei ATO2.1 Advanced Technical Ortho Supergraphic?

The descriptions on the Freestyle Website make it sound like Advanced Technical Ortho Supergraphic is the film that is better suited to pictorial use ("controllable contrast", whatever that means), even though the name makes it sound like the opposite would hold true. However, the data sheet for the "plain" Ortho 25 shows curves for D-76, and some of them look plenty "pictorial capable" to me; similar to other ISO 25 and 50 films in that exposure latitude is narrow, but definitely workable (and quite beautiful once "nailed").

I am looking for something to use in my Brownie that may not be as affected by the rear frame counter window as a panchromatic film. I want a film that produces "normal" contrast and continuous tone.

Thanks in advance.

 

[thmm]

Have a look at the manufacturer's descriptions (not the best translations maybe, but they should do):

http://macodirect.de/rollei-sheet-filmbr102x127cm-inchbr10-blatt-p-1085.html?language=en
http://macodirect.de/rollei-ortho-sheet-filmbr4x510-p-1250.html?language=en

The upshot is, paraphrased, that the ATO is capable of "almost pictorial results, but with steeper gradation" in low contrast developers for "dramatic-looking results", while the Ortho 25 can be souped to give normal, non-exaggerated contrast, preferably in a low-contrast developer.

 

[RobertV]

Indeed Ortho ATO2,1 has a very steep curve while the Rollei Ortho 25 is a regular ortho film.

For the last one I can recommend for regular pictographic use as developer:
Ortho 25 E.I. 25 with Rollei Low Contrast (RLC) developer.
Ortho 25 E.I. 32 with Diafine 3+3 minutes.

Two excellent (low contrast) developers for this film.

Best regards,

Robert