Thank you for posting the link to the review! It's nice to see people enjoying the film.
As I mentioned, I have no reason not to like this film. I think it has an interesting "punchy" kind of look, when exposed and developed according to the instructions on the box. It's also great to see that one's personal EI works out very well for them. That's what it's all about.
Testing film in a controlled environment is kind of different from finding one's preferred parameters with actual, real-world photography. There has been some discussion in the film sensitometry literature over the years emphasizing the role of subjective negative and print assessment, rather than analysis purely by the numbers, so keep that in mind, please.
I am attaching the results of my analysis as a PDF so you guys can see the them more clearly.
Please, feel free to pick holes in my analysis. I want to learn to do a better job in the future!
There are a few things I need to mention first.
1. The film is underexposed, so the curves have a very unusual shape. Modeling such curves is a challenge. There is some extrapolation involved, which, any statistician will tell you, is a big no-no
. The extrapolated bits are marked with black dotted lines.
3. I considered giving the film more exposure, but that would involve significant contribution from reciprocity, which would make the analysis a lot less reliable, without knowing the actual reciprocity failure values from the manufacturer.
4.
All of the numbers computed here are done entirely by algorithm, so they are
approximate. It is particularly true of Gamma where finding the "straight portion of the curve" is typically subject to interpretation by the photographer. Here, Gamma is computed by finding the straight line statistically (the green dotted line). Fractional gradient is somewhat similar in that regard. Other parameters are also subject to some variability, but should, nevertheless, get you in the ballpark.
5. On page 3, I overlaid the curve from expired Fujifilm Neopan 400, exposed the same way as the Catlabs 320 Pro and processed in the same tank for 8 minutes. You can see much higher B+F density due to the type of film base itself and increased fog due to the the film aging.
6. The "ISO curve" and triangle are marked in pink on p. 3
7. There is
a lot more detail that's not printed in the PDF, so please free to ask questions.
8. The plots on pages 8-10 are similar to those you get in the BTZS-type of anlalysis and are available in the application called WinPlotter. It's an old piece of software, but it has some really interesting functionality.
