O'Meara wrote:

 "This is the Sprague image below.
Do you notice the light square around the two men?
What do you think that is?"



I think it is a technical lightening feature Kamp inserted to emphasize who was being looked at...It has nothing to do with the photographic quality of the Sprague copy...

I believe the plaid pattern could be replicated in either the original Couch Film or 6th Floor Museum copy of Darnell...

Larsen proved the plaid pattern in Lovelady's shirt in Sprague matched the plaid pattern on his shirt in other photos exactly...Larsen, after I told him that proved the timing of when Frazier said he was talking to Stanton on the steps, then went back and deleted his post on The Education Forum showing that match...This is a prime example of the playing field that currently exists on the JFK internet...

The image above is the opening frame of Jimmy Darnell's footage of the immediate aftermath of the JFKA.
I would like to determine, to the second if possible, how long after the headshot this footage started.
One thing that should be visible in this footage is Dave Weigman getting out of the car in front and sprinting towards the concrete pergola on the GK.
The only thing that catches my eye at the moment is a detail off in the distance.

In the crop below, in the red circle are Umbrella Man and Dark Complected Man sat down.
In the yellow circle is the Newman's lying flat on the grass. The reason this is important is that there are no photographers stood around them. This is something that seemed to happen really quickly and it might be possible to use this detail for a timeline:

Read my lips, danny BOY o'meara.

What you've posted, above, isn't the "opening frame" of Darnell.