why are there two of these films? What are the ...
why are there two of these films? What are the differences between this film and SRF618?
Asked by: Michael
The simple answer is SRF618 is A wind and SRF458 is B wind.
"Q. What is the difference between A-wind and B-wind?
" A. Wind refers to the relationship between image direction and emulsion position. Images on the film that are “B-Wind” read correctly through the base. Images on the film that are “A-Wind” read correctly through the emulsion. All camera negative original is “B-wind”. When you contact print your original onto an answer print, the AP becomes “A-Wind”