White knows nothing of photography. He is not a recognized photo expert in any sense of the word. He does stuff that makes no sense, and then proclaims he has found something significant (his take on the various photographs of Oswald's rifle is very revealing in this regard, as he failed to account for perspective). That is not an ad hominem; that is a fact. Quite simply, White's failure to account for perspective caused him to conclude that the photos showed different rifles in each of the photos he studied; when real experts studied the photos and took perspective into account they concluded there was only one rifle shown in all the photos studied.*
Robert, White's analysis is akin to measuring the railroad ties in this photo, and concluding the ties get smaller as they move away from the camera:
http://sciencebusiness.technewslit.com/?p=4439
Likewise, by failing to account for perspective, White reached an erroneous conclusion concerning the rifle photos.
You can read his testimony before Congress here; do take off the blinders before you do so; it is very revealing of what passes for an expert in Conspiracy Logic 101.
http://mcadams.posc.mu.edu/jwhite.txt
Lately he has taken up the moon landing and believes that is faked as well.
http://aulis.com/jackstudies_index1.html
The other three have credentials, but not photography credentials, as I previously pointed out. Their criticisms / opinions are meaningless, and would never be allowed to be heard by a jury (none of the four men opinions you cite would be recognized as an photography expert in any court in the land; they could not survive the voir dire process). That likewise is not an ad hominem; that too is a fact.
How come the best Robert can do is cite the opinion of non-experts that the film is tampered with?
Robert, don't you have any legitimate experts who have examined the Zapruder film camera original (as Zavada did) and concluded it was falsified in any manner?
Where can I read their report?
What's that, you have NO legitimate criticisms and yet you persist in this nonsense?
Hank
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* The HSCA Photographic Panel's conclusions about the rifle photos starts here:
http://www.historymatters.com/archive/jfk/hsca/reportvols/vol6/html/HSCA_Vol6_0036b.htm