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

[Chris Davidson]

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.

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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.
David, My calcs/equation have nothing to do with the length of film. But, at 80frames per ft, 25ft gets you 2000 frames

You know immediately that taking 48fps to 16fps is simply what you did - keep 1 remove 2
The only reason for using this sequence was to show the smoothest motion in regards to a removal ratio of something close to 2.62/1.
1/2.62 =.381 1/3 =.333 or 1/3 2/6 3/9 4/12 etc….

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.
Don't knock your brain out with this.

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. This either.

It may only have started at z158 and the reason for the break in the film. IDK. Or near there. and 48fps may have ended well before the extant 486. We don't know. Agreed.
There is also the stop which is removed adding even more frames. I don't disagree, but, this might be impossible to actually prove, in terms of the film itself.

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. I'm still fairly sure that 18.3 was used in accordance with the vertical/horizontal slope formula for Elm St.

Everything appears to have been worked out in reverse from 313. I agree. - irrespective of the physical realities of the place or what the evidence shows. WCD298 is the FBI's explanation of the events. They had to accommodate the limo length and distance's within Z313 represents the 2nd shot not the third. Agree

Remember, they have to have the film jive with a 6th floor shooter, in terms of vertical as well as horizontal distances.

chris

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