motion picture print films and anti-halation layer

[vencahaus]

I would like to copy my negatives on print films to make slides.

Reading the datasheets for Kodak print film 5302 or Orwo PF2, there is not even a mention of anti-halation layer. Only 2302 print film seems to have that layer.

Does this mean that there is no need for anti-halo layer when contact-printing on films? What if I would like to print also optically on these films? Maybe that the layer is needed only when dealing with high-contrast real scenes that are shot on camera films?

I looked for other high-contrast films like Rollei ATP 1.1 and there seems to be no anti-halation as well. At least the datasheet on Macodirect's website does not mention it (while it do so for other films).

 

[georgegrosu]

Positive films b&w does not have anti-halo layer.
You can use them both without any problems for contact or optical printing.
I used positive b&w Kodak 5302 as negative no problem with antihalo layer absence.
http://img407.imageshack.us/i/pozitivan35mmcatelg.jpg/
George

 

[vencahaus]

Thank you for the information and the link, it seems that halo effect can be found only in very highlight of the image so copying a negative of about gamma=0.65 should not be an issue.

I am just curious how is that possible. Maybe the emulsion layer on these films is so thick that the light does not get through? Or it's simply assumed that these are used only/primarily to print low-contrast negatives (a common feature of motion picture negatives)?

 

[georgegrosu]

Positive b&w is a film with a very low sensitivity (~ 6 ISO).
Halo is a chance to appear weak.
Contrast of the negatives film is smaller (~ 0.6) and the photo film is higher (~ 0.7 ...).
This difference in negative movie film contrast is not a problem for positive b&w in the halo.
George

 

[cmacd123]

2302 probably has an anti-static layer. The Polyester base is known to attract dust, and the theatre plater systems are great at exposing the film to it.

 

[georgegrosu]

Print Film 2302 - „Film 2302 is coated on ESTAR Base, featuring a proprietary electrically conductive antistatic layer, a scratch-resistant backing layer, and a process-surviving backside lubricant.”
http://motion.kodak.com/US/en/motion/Products/Distribution_And_Exhibition/so302/techSO302.htm
Positive Film 5302 - „This film has a clear acetate safety base with anti-static protection, and a base thickness of 5.6 mils. In addition, 7302 Film has an anti-curl layer applied to the base.” http://motion.kodak.com/US/en/motion/Products/Distribution_And_Exhibition/5302.htm
Print Film 2302 and positive film 5302 have a anti-static protection. No anti-halation layer.
George