Ilford Pan F and Delta 100, Efke 25, Fuji Acros 100 MTF charts

[braxus]

I have read Fuji Acros 100 is equivalent to Tmax 100 in terms of lines per mm at 1:6 and 1:1000. Has anyone actually seen a MTF chart for Acros? And can you confirm Acros is just as sharp as Tmax 100?

Also are there MTF charts (Simon?) for Ilford Pan F and Delta 100? I haven't found any details on those two films in this type of info.

Also how does Efke/Adox 25 hold its own in sharpness compared to Tmax 100? I haven't seen any advertised info on that film either.

 

[Tom Hoskinson]

I have read Fuji Acros 100 is equivalent to Tmax 100 in terms of lines per mm at 1:6 and 1:1000. Has anyone actually seen a MTF chart for Acros? And can you confirm Acros is just as sharp as Tmax 100?

Also are there MTF charts (Simon?) for Ilford Pan F and Delta 100? I haven't found any details on those two films in this type of info.

Also how does Efke/Adox 25 hold its own in sharpness compared to Tmax 100? I haven't seen any advertised info on that film either.

With all of these films, the developer and developing procedure used will affect the Diffuse RMS Granularity, the Spatial Resolution, the Contrast Resolution and therefore the MTF results for all of these films.

Do your own testing and use the film/developer you like the best.

My own tests indicate that there is very little difference in spatial resolution or Diffuse RMS Granularity between Kodak TMax 100, Fuji Acros 100 and Ilford Delta 100.

 

[Tom Hoskinson]

http://www.fujifilmusa.com/JSP/fuji/epartners/proPhotoProductsNeopanDataSpec.jsp

http://www.fujifilmusa.com/JSP/fuji/epartners/bin/NeopanAcros100.pdf

Fuji Acros 100

Diffuse RMS Granularity value = 7

60 line pairs/mm at 6:1 Target Chart Contrast

200 line pairs/mm at 1000:1 Target Chart Contrast


http://www.kodak.com/global/en/professional/products/films/bw/tMax.jhtml?id=0.2.24.14.19.18&lc=en


Kodak TMax 100

Diffuse RMS Granularity value = 8

63 line pairs/mm at 6:1 Target Chart Contrast

200 line pairs/mm at 1000:1 Target Chart Contrast

 

[momonga]

The Acros diffuse RMS granularity value of 7 is based on development in undiluted Microfine, which is equivalent to Perceptol or Microdol-X. An older Fuji handbook also supplied the granularity value for Acros when developed in Fujidol-E (similar to Xtol), in which case it rose to 7.5.

Kodak's measurements are based on development in straight D76. I've found that 100TMax is slightly (I emphasize 'slightly'), but definitely, finer grained in Fujidol-E than in D76. Perhaps even lowering it to 7.5.

The point is, while Fuji's claim of a diffused RMS granularity value of 7 appears much better than 100TMax's 8, actually there is little or no difference between them. In terms of grain.

However, in terms of perceived sharpness (not resolution), many people seem to find that Acros 'looks' sharper, has more edge to it. I am one of them. Both provide equal detail, yet that same detail seems to pop in Acros, and in 100Tmax it seems submerged, softer edged.

I have never seen any MTF charts for Acros.

 

[Jed Freudenthal]

I have read Fuji Acros 100 is equivalent to Tmax 100 in terms of lines per mm at 1:6 and 1:1000. Has anyone actually seen a MTF chart for Acros? And can you confirm Acros is just as sharp as Tmax 100?

Also are there MTF charts (Simon?) for Ilford Pan F and Delta 100? I haven't found any details on those two films in this type of info.

Also how does Efke/Adox 25 hold its own in sharpness compared to Tmax 100? I haven't seen any advertised info on that film either.

See:
http://www.normankoren.com/Tutorials/MTF1A.html for an overview of data.
Agfa-Gevaert, Fuji and Foma have extensive data. Kodak used to have them, but it is different at the moment.
Ilford is using an equivalent of MTF, but up to now they do not publish these data. However, one might expect they do so in the future, because of the ISO 9000 certification, they have at the moment.
Efke/Adox 25 has not published data. But MTF must be high in the high spatial frequencies and near 100% at the lower frequencies for ABC type pyrogallol developers.

Jed

 

[momonga]

The current Fujifilm English language website does not seem to have any information on their B&W products. The Japanese language site does, but there are no MTF charts, only the diffuse rms granularity values, resolving power, and spectral sensitivity curves, along with the usual characteristic curves, developing times, etc.