Ornello Posted January 4, 2022 Share #1 Posted January 4, 2022 (edited) Advertisement (gone after registration) All those who believe the nonsense about 'less silver' being used in today's materials need to read and understand these articles. https://www.photrio.com/forum/threads/photo-system-engineering-i-the-fundamentals.35197/ https://www.photrio.com/forum/threads/photo-system-engineering-ii-b-w-negative-films.35278/ https://www.photrio.com/forum/threads/photo-system-engineering-iii-b-w-film-2.35520/ Edited January 4, 2022 by Ornello 1 Link to post Share on other sites More sharing options...
Advertisement Posted January 4, 2022 Posted January 4, 2022 Hi Ornello, Take a look here All about B&W films. I'm sure you'll find what you were looking for!
kivis Posted January 4, 2022 Share #2 Posted January 4, 2022 Author is from Rochester, NY which means he is probably a really smart guy. Link to post Share on other sites More sharing options...
Ornello Posted January 4, 2022 Author Share #3 Posted January 4, 2022 2 hours ago, kivis said: Author is from Rochester, NY which means he is probably a really smart guy. I believe he's a former Kodak engineer. Link to post Share on other sites More sharing options...
chrism Posted January 6, 2022 Share #4 Posted January 6, 2022 Was, not is. Ron died in February 2020, and is much missed at APUG/Photrio. 2 Link to post Share on other sites More sharing options...
Ornello Posted January 18, 2022 Author Share #5 Posted January 18, 2022 (edited) Here is a comment that I have verified: from https://www.photrio.com/forum/threads/getting-density-with-delta-3200-in-pyrocat-hd.179108/ "I have made the observation, that Delta 3200 needs a lot more developer than other films. If you look at instructions for liquid film developer concentrates, quite often higher concentrations are listed for Delta 3200 than for other film. I have the impression, that Delta 3200 releases massive amounts of iodide during development. This released iodide strongly restrains high density areas, while allowing weakly exposed areas to fully develop. The result is a high speed rating and great pushability without runaway highlights. At the same time it makes this particular film very unsuitable for dilute developers." Based on my recent tests of T-Max 400, Delta 400, FP4+, HP5+, Tri-X, T-Max 3200, and Delta 3200, I have found that the T-Max films require more compensating development. Using Adox FX-39, I have worked out the following development times and dilutions for printing on grade 3 with a condenser enlarger (all @ 68F/20C) T-Max 400 1+17: 9 minutes Delta 400 1+14: 9 minutes HP5+ 1+14: 8 minutes Tri-X 1+14: 8 minutes Delta 3200 1+14: 12-14 minutes T-Max 3200 1+17: 12 minutes FP4+ 1+17: 7.5 minutes Pan-F 1+19: 7 minutes You can see the comparison between T-Max developer and FX-39 developer on T-Max 400 here: https://fotoimport.no/filmtmax400 Note the shoulder produced with FX-39. Edited January 18, 2022 by Ornello Link to post Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now