How much could you alter the film if Abraham Zapruder had shot in slow motion mode?

[David Josephs]

Thanks Chris - the 15fps play speed makes the movie look slower than would normally be if played at 18fps - correct?
Yes, that is correct.

The other thing is that the final ratio of total starting frames to total ending frames needs to be 18.3
48/18.3 conversion ratio is provable in a particular spot on CE884.

48fps / 18.3 fps = 2.623
486 frames x 2.623 = 1275 total frames if it was all filmed at 48fps.

In your motorcycle example, take the total frames and divide by 2.623 to get the ending # of frames required.

136 frames / 2.623 = 52 frames which means we need to cut 84 frames and show at 18fps on a projector.

Just look how jumpy this is even though it is stabilized. the jerkiness of the forward motion of the limo is exactly what we see when removing frames from the motorcycle scene
When the limo slows just before 313 it also smooth and then just after, it looks like a number of frames are gone - there is a jump in the film and the impossibly fast movements of Greer and Kellerman.
Probably what occurs when you break sequence and add multiple 48fps frames back to the extant film.

I removed the 2nd and 3rd frame from each 3 frame pair thru the turn then it goes back to no frames missing at 48fps shown at 18fps.roof
Your proof of concept is well-established. Don't spend too much time recreating multiple sequences, we understand the concept. imo

chris

P.S. Still pondering how to introduce the supporting equation for 48fps/18.3fps conversion.

1

I did those calcs as well Chris. Based on the size of a frame and the 25 feet of film there are only so many frames available in total on 25 feet of film.

You know immediately that taking 48fps to 16fps is simply what you did - keep 1 remove 2

As mentioned, if the entire 486 net frames was filmed at 48fps we'd have 1275 total frames to start with YET we still have not added back what is between 132 and 133.

With a large chunk of frames removed I am of the opinion that 48fps does not begin until 133. How many frames where there originally between 132 and 133 is hard to tell yet
it is obviously more than a few seconds of film - which in turn adds to the total length of film taken.

It may only have started at z158 and the reason for the break in the film. IDK. and 48fps may have ended well before the extant 486. We don't know.
There is also the stop which is removed adding even more frames.

I get the feeling that alteration was done with an awareness of this 3:1 ratio but they simply could not remove any more of the film and had to go with an 18.3 fps figure despite it not being one of the speed setting on that camera.

Everything appears to have been worked out in reverse from 313 - irrespective of the physical realities of the place or what the evidence shows. WCD298 is the FBI's explanation of the events. Z313 represents the 2nd shot not the third.

"Wehave not yet examined the assassination scene to determine
whetherthe assassin in fact could have shot the President prior to
frame190. We could locate the position on theground which
correspondsto this frame and it would then be our intent to establish
byphotography that the assassin would have fired the first shot at the
Presidentprior to this point. Our intention isnot to establish the
pointwith complete accuracy, but merely to substantiate the
hypothesiswhich underlies the conclusions that Oswald was the sole
assassin."

<snip>
"Ishould add that the facts which we now have in our
possession,submitted to us in separate reports from the FBI and
SecretService, are totally incorrect and, if left uncorrected, will
presenta completely misleading picture."

It may well be that this project should be undertaken by the
FBI and Secret Service with our assistance instead of being done as a
staff project. The important thing is that the project be undertaken
expeditiously."

- Redlich to Rankin April 27, 1964