It unclear whether that graph is for the Rollei Ortho or discontinued
Ilford Ortho
On Tue, Sep 12, 2017 at 3:39 PM, `Richard Knoppow <dickburk@xxxxxxxxxxxxx>
wrote:
From the spectrogram shown on the page linked below the sensitivity is
very similar to "classic" ortho films as shown in Kodak and Ansco film
booklets from about 1950. While the sensitivity of those films varies from
one to another most are sensitive down to about 550nM. Both Kodak and Ansco
are about the same. Some special purpose ortho films, like Kodak Commercial
Ortho do not have much green sensitivty but the general purpose films are
fairly flat down to about 550nM above which they drop off rapidly. The
curve shown is for Ilford Ortho Plus which seems much like the older films.
I can't find a spectrogram for the Rollei product.
I am reminded again that Ansco made some excellent films and papers.
On 9/12/2017 11:50 AM, Eric Goldstein wrote:
It's been out of stock in 120 for a while. Freesyle shows it back
available in early November but I am skeptical
Also, the spectral sensitivity of the Rollei film is not classically
ortho. But it is still a fine film
https://dacnard.wordpress.com/2013/02/15/the-real-shades-of-
gray-bw-film-is-a-matter-of-heart-pt-1/
This is the best price I have found if it becomes available again
https://www.camerafilmphoto.com/product/rollei-ortho-25-120/
--
Richard Knoppowdickburk@xxxxxxxxxxxxx
WB6KBL
