I've been one of the few lucky guys who had the chance to buy quite a lot of Film Ferrania P30. I did a lot of detailed testing including sensitometric tests with a densitometer and evaluating the characteristic curves of several developer combinations with P30.
Unfortunately all the results have not been satisfying. Because
- P30 is not an ASA 80 film, the speed is significantly lower, even in developers which offer very good sensivity/speed
- depending on the developer type you get quite problematic characteristic curves / tonality
- the gradation is very steep, you get very high contrast
- depending on the developer you have to sacrifice either shadow detail or highlight detail: it is impossible to get a normal linear characteristic curve with smooth tonality and good detail both in the shadows and highlights. Either the shadows are empty, or the highligths are blown out.
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If you have performed densitometer tests with a step tablet, and created graphs of the resulting curves for a variety of developers, it would be of interest to see those, as long as each graph was annotated with the information as to the developer used, developing time, developer temperature, and exact agitation method used which resulted in that particular curve.
I've looked at almost all P30 pictures published so far ......
The better or acceptable pictures (from a technical point of view) were those where the object contrast was relatively low. That helps a lot when you have a film with the sensitometric problems I've described.
In higher contrast scenes either the shadows were empty with little or no detail, or the highlights were burnt with no detail.
You cannot fool physics:.....
I don’t think anyone is trying to fool physics, which would prove daunting in any event. P30 seems to be, as you note, a high contrast film without as much exposure latitude as something like Tri-X, susceptible to blown out highlights or dense shadows if used in high contrast situations, and thus better used in lower contrast situations. Similar to transparency films, in other words. It seems to have other meaningful characteristics as a film which are appealing, if exposed and processed correctly, which make it desirable from an esthetic standpoint, whether someone judges it’s curve to be “problematic” or not.
Looking at the same P30 pictures published so far, my I opinion is that some of them are not only acceptable, they are outstanding, a cut above what I might routinely see with some other films. That’s a personal esthetic judgment, esthetics being a club where physics is not a voting member.
The question is how to best achieve those results,
for those to whom those results are important. That’s where your densitometry results could be valuable to everyone. Not the conclusions, but the results. I am not convinced, personally, that P30 needs to be improved, but it does need to be understood. Access to the raw densitometric graphs, correlated with the developers and methods which were used to produce those graphs, would help others draw their own conclusions as to how to use the film to best achieve the excellent results which are obviously possible, and what the film’s ideal operating window is. As much work as you have gone to to map out the curves, it would be extremely helpful if others could see those, if that would be possible.
Thanks in advance.