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exposure pressure!

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#1 Marco Montenegro

Marco Montenegro

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Posted 16 December 2014 - 06:46 PM

Hello there guys, i am attaching email i got back from telecine guy, talking about "pressure exposure"

here is part of that email:

 

"First I looked at that roll over a light box. The surface of the negative looks spotless. No dirt, no scratches. BUT, if I look THROUGH the film, I can see a faint double mark, running on the left side of frame, about 1/3 of the way in from the edge. Next, I looked at the video transfer. What I'm seeing, is pressure exposure. Film is sensitive to pressure as well as light. The higher the speed of the film (ISO), the greater the sensitivity to pressure. This roll was 7219, so it's 500 ISO - very sensitive to pressure."

 

It is great that he took his time, to give me idea on my transferred stock, but i am still confused what is the pressure exposure, what affects it, and any way that someone in simple lingo, can explain me about it.

 

I have about 10 rolls of 500T, i am planning to use, so i just want to be sure what i am doing,

 

Many thanks,

 

Marco Montenegro

 


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#2 David Mullen ASC

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Posted 16 December 2014 - 08:00 PM

If you bend, fold, or stretch the film too much, it can cause horizontal marks. Maybe you have a mis-set loop or something, I don't know. Maybe the roll got some severe hit edge-on.
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Willys Widgets

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The Slider

Gamma Ray Digital Inc

Aerial Filmworks

rebotnix Technologies

Visual Products

CineLab

FJS International, LLC