georg16nik
Member
- Joined
- Aug 3, 2010
- Messages
- 1,102
- Format
- Multi Format
The new Foma Ortho 400 is coated on polyester base without antihalation layer – it's in the tech data for the film.Then why Ilford Ortho or the recent Foma Ortho or Ferrania Orto are all still coated on triacetate base?
About 10 years ago I remember how Kodak Tri-X in 135 and 120 were coated on acetate base, while 4 x 5, 5 x 7, 8 x 10 used ESTAR (PET) base.It was probably too expensive to do the engineering for PET.
The light piping issues might be more problematic as well for an ortho film - I don't know.
Acetate is non-archival base, while ESTAR(PET) is archival – per ISO criteria.