Orthochromatic Film

[bigdog]

Can someone with experience using orthochromatic film chime in?

I need info on effects produced ...and what is the overall look and results achieved using this increased blue/green of the light spectrum sensative film?

I am looking at buying some ADOX 25 Orthochromatic Film ...how would you compare it to Efke 25 of which I have shot a dozen or so rolls.

What results are acheived when using a red #25 filter and also a dark yellow filter in combination with this film?

I will not be developing the film myself so I do not need information regarding development but any information on any special requirements or tips for rating the film at exposure would be appreciated.

Thanks!

 

[mhv]

Ortho films are called "ortho" (correct) for a reason: when they were invented about a hundred years ago, they gave a much more "normal" look than the previous generation of blue-sensitive only emulsions. They look a lot like panchromatic films, except that anything red will render as dark.

That said, ortho films have a particular look. They are incredibly fine grained and sharp (sharper than Efke 25 I find), but tend to be contrasty. You want to avoid overdeveloping them: I usually soup them in Rodinal 1+100, but any dilute developer will work.

There is no point in using a Red filter on ortho film: ortho are sensible to blue and green, and not, or very little to red.

 

[mhv]

Here's what an ortho film makes of a red fire hydrant

And here is what a blue-sensitive film makes of it:

Depending on the wavelengths reflected by certain pigments and/or objects, your reds may come out darker or lighter, but overall they will be dark.

 

[larmarv916]

I would ask what is the subject or what about that subject do you want ADOX to help you leverage. I shoot both Efke and ADOX 25. As well as the 50 and 100 versions of ADOX. Also the Yellow filter is benefical, but again you can get multiple verions. A deep yellow gives strong effects.

As for ASA ratings...It will depend on which developer your lab is using and also dilution. Over agiation will really bring up grain for now reason. So be advised. And I find the ADOX does not not like being "baked" above 68 F or you get unwanted effects.

What are you shoooing to gain other than just high resoultion images.

Best Regards....Laurance