Chris Livsey
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- Aug 10, 2008
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All 35mm sprockets are "Movie" dimensions.
the two most common are BH (also called Negative) and KS (Kodak Standard also called Positive) the BH perfs have rounded ends and are used in Most movie Cameras. for technical reasons they normally have .1866 inch centers. the KS perfs have rectangualr holes and are generaly .1870 inch centers. (not that most folks can measure that .0004 inch difference.)
Almost all Still film is provided with KS1870 perfs.
Ferrania did say they were using a "positive film" perforator to prepair this stuff, using a "ferrania" plate to endorse the edge of the film. they also indicated that the name reads right on the emulsion side, which if you think about how movie prints are made would be right as the words would read right when you were looking at a print where the titles and such also read correctly. (which for a contact print from a negative would be the emulsion side)
So yes, you can expect the (correct) movie perfs....
Thank you for the expansion, I am well aware of the difference in the perfs shooting ORWO N74 and Kodak 5222 regularly, I have checked this am and the perfs on P30 are not BH perfs , it is clear visually and measuring is not required they are standard still 35mm perfs. not rounded as on 5222/N74.
It does not explain why Ferrania are advising against motor drives, it is well known that some drives with BH perf film can be destructive, Leica MOT cameras for example when motor driven. I did find loading the film was tightly wound in the cassette not slack with room for reverse winding and that tension may have cause a tear in a motor drive camera but that is pure speculation as the second roll I checked was quite loose as is normal. I tend to tighten the film back so I get a clear indication of a correct load with my Leicas.