Is Fuji Acros 100 Partially Orthochromatic?

[braxus]

I don't really have any experience with this film, though I did stock up on some rolls when it was discontinued a year ago. Im aware of version II coming out now. Anyway reading on another page or thread somewhere, someone suggested this film has a little orthochromatic look. Is this BS or is there some truth to it? What would I expect when shooting portraits with this film for example? Anyone want to post some samples showing either way with this film? I think they said not to use a red filter with this film, but I could be wrong on that one.

 

[Andrew O'Neill]

It's Orthopanchromatic. If you look at a spectral sensitivity graph, it's sensitive more to blue and UV, more so than say, FP4, HP5... It's sensitivity to red is about the same as most pan films. I have used a red filter with Acros... No problem there. But quite honestly, I cannot see a difference when compared to the pan films that I use.

 

[braxus]

Is their a spectral graph for the film of either version? How far into the red does it go? Efke 25 was orthopanchromatic, but its sensitivity only went to 610. Wondering where Acros sits there?

 

[braxus]

Found it. Its a bit higher then Efke 25.

 

[Christiaan Phleger]

That little nudge upwards past 610 might be useful....

 

[braxus]

Im trying to find a good replacement for Efke 25. Adox CHS II 100 is a beautiful film, but is grainier. I love the scans I've seen from Acros 100 so far. It might be my go to medium speed film, which is also replacing Plus X. Though Plus X is closer to Adox 100 in grain size then Acros 100.

 

[DWThomas]

It sometimes seemed to me that the spectral sensitivity of Acros resulted in skies/clouds taken without filtration appearing more like using a light yellow filter with other pan films. However I can't say I've tried any seriously precise testing of that, and it's also true that the angle of the sun, time of day, atmospheric haze, etc. can affect photographs of the sky. I stopped worrying about it when the film's demise was announced -- guess now I need to think about it some more!

 

[braxus]

I think I read Across doesn't like filtration of any kind. Can't confirm that though.