[tig] State of the art for 3-perf?
Wed Sep 15 19:03:09 BST 2004
Young Mr Orton of the Antipodes was asking generally about 3 perf 35mm.
A point that comes to mind where precision is important is steadiness.
I may be repeating myself or someone elses posting here !
Kodak punch their perfs in groups of 4, OK 8 if you are counting both
They reference the punched set to a perf on the previous punched frame.
Therefore their punches have 5 pins, One locates in previous frames perf
four punch new frame
This guarentees that , subject to the punches not being worn, a group of 4
will always be positioned exactly the same as a previuos set or next set
of 4 perfs.
Now consider tha the punch is slightly skewed, the 4 perfs will skew on the
but ths does not matter as the camera pins will always located in the same
in the group of 4.
HOWEVER with a 3 perf camera the pins will enter a differernt set of the
group of 4 perfs on each pull down, only repeating for a "same 4 perf hole"
4 pull downs.
This can mean instability that repeats in cycles every 4 frames !
It depends of copurse on how parallel the punch was to start with
Peter Swinson Associates Limited
BTW Mike, Have you found any pretty sheep down there yet ?
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