Originally Posted by Photo Engineer
I just checked the data sheets for EKTAR, PORTRA 160 and PORTRA 400. All three say sheet sizes are on ESTAR (polyester) base. TMAX 100 and TMAX 400 as well as TRI-X sheets are also on ESTAR bases. So, for the time being, Ron's speculation applies to roll film only, at least as far as acetate outsourcing is concerned.
Originally Posted by PKM-25