23-08-2013, 01:40 AM
David - my feelings about the camera and the ability to change speeds:
If Zapruder tried to switch from 48fps to 16fps mid-shot (i.e. film passing through the gate) then one or more of at least three things would happen -
1) most likely, the pins moving the sprocket holes past the gate would shudder due to the sudden change in speed, the film loop leading to the gate would be lost, and the film would either jam or snap, or it would lose its registration point in the gate
2) if by lucky chance the film did continue to move, there would be obvious exposure issues for a fair number of frames as the camera's iris adjusted
3) even before the above occurred, the mere act of engaging the switch would create a visible disruption to the panning camera movement as it followed the limo.
my reservations about Z-film alteration are based on technical issues related to optical printing. I also tentatively think that answers to some Z-film anomalies lies in the mechanics of Zapruder's spring-wound camera. Related to that, I believe that the notion of expecting the Z-film to serve as any kind of accurate "clock" to events is misplaced faith, alteration or no alteration.
Might the CIA's reluctance to admit interest in the Z-film have anything to do with the report the NPIC presented on Nov 25 which stated there were at least two shooters?
If Zapruder tried to switch from 48fps to 16fps mid-shot (i.e. film passing through the gate) then one or more of at least three things would happen -
1) most likely, the pins moving the sprocket holes past the gate would shudder due to the sudden change in speed, the film loop leading to the gate would be lost, and the film would either jam or snap, or it would lose its registration point in the gate
2) if by lucky chance the film did continue to move, there would be obvious exposure issues for a fair number of frames as the camera's iris adjusted
3) even before the above occurred, the mere act of engaging the switch would create a visible disruption to the panning camera movement as it followed the limo.
my reservations about Z-film alteration are based on technical issues related to optical printing. I also tentatively think that answers to some Z-film anomalies lies in the mechanics of Zapruder's spring-wound camera. Related to that, I believe that the notion of expecting the Z-film to serve as any kind of accurate "clock" to events is misplaced faith, alteration or no alteration.
Might the CIA's reluctance to admit interest in the Z-film have anything to do with the report the NPIC presented on Nov 25 which stated there were at least two shooters?