Ferrania P30-P33-ORTO sensitometric official data

[DeletedAcct1]

https://www.ars-imago.com/web/content/310626?access_token=c7c0e2d3-5317-42f4-bf4d-ab24862f3dbd&unique=5db1f5442af98fd9c75427c19869e1b0abab96bb&download=true

 

[Andrew O'Neill]

I sure wish this information was made available earlier but... better late than never! Also, I find it hard to believe that P30 has more red sensitivity than P33...according to the spectral response graphs. Thanks for sharing, Alessandro!

 

[Tomro]

the author of this PDF is Felix Bielser, owner of a photographic store in Milan (PFG http://www.puntofoto.it/).

 

[pentaxuser]

the author of this PDF is Felix Bielser, owner of a photographic store in Milan (PFG http://www.puntofoto.it/).

This person may have made a perfectly accurate test of the sensitometric data but as the owner of a photographic store in Milan isn't saying it is official data somewhat misleading?Doesn't the official data have to come from Ferrania to be official?

I wonder how we reconcile this data with Andrew O'Neill's findings from which he expresses surprise that P30 has more red sensitivity than P33 as per the official data ? From what I remember of his videos on both films his findings didn't seem to bear out the "official" data

pentaxuser

 

[Andrew O'Neill]

This person may have made a perfectly accurate test of the sensitometric data but as the owner of a photographic store in Milan isn't saying it is official data somewhat misleading?Doesn't the official data have to come from Ferrania to be official?

I wonder how we reconcile this data with Andrew O'Neill's findings from which he expresses surprise that P30 has more red sensitivity than P33 as per the official data ? From what I remember of his videos on both films his findings didn't seem to bear out the "official" data

pentaxuser

I really cannot trust the spectral graphs, especially after seeing all the P30 images posted over the years showing an obvious de-sensitisation to red. I trust the characteristic curve, though. P30 does have a long toe, long, steep straight section, as shown by aparat's curves: (https://www.photrio.com/forum/threads/slow-and-steady-ferrania-p30-ilford-pan-f-plus-etc.196266/)