8mm Forum: T function on bolexH16

This is topic T function on bolexH16 in forum 16mm Forum at 8mm Forum.

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Posted by Louis Li (Member # 776) on December 01, 2007, 12:17 PM:

on the bolex h16.
could someone explain to me about the effect when using the (T) instead of the usual (I) while filming.

am i right to say that the rotating shutter is on hold.
while the film continues.
do we get some kind of motion blur lines?
and what if this was applied to stop animation?

thanks

Posted by Claus Harding (Member # 702) on December 01, 2007, 01:38 PM:

Louis,

The 'T' evidently is for individual-frame longer-time exposures, according to this (scroll down to middle of page):

http://www.alphasensory.com/Skatetown/BolexH16.html

If that is the case, that could possibly be an interesting function to use for animation.

Best,
Claus.

Posted by John Whittle (Member # 22) on December 05, 2007, 12:19 PM:

As I recall, when you use the cable release and put the camera in the "T" position, then when you press in on the cable release the shutter opens and when you release the cable the shutter closes and the film advances.

This is useful if you need to do a long exposure of a subject and would be used in a case where you set up an automatic system to take say one frame every 30 seconds and you needed a one second exposure because of light levels (say roots growing out of a planted seed). When projected at 24 fps per second, each second of screen time would be 12 minutes of actual clock time.

Also would be useful in stop motion or puppet photography where you need great dept of field and hence a very small f/stop and didn't want a lot of blazzing lights so you could do your version of a George Pal Short, etc.

John

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