Pathetic nonsense. I've already supplied plenty of "shreds", none of which meet your approval because you prefer to be hung up on the word "expert." But you know very well, that as already has been cited, Major John Pickard, a former commander of the photographic department of the Canadian Defense Department, examined the B/Y photos and declared them to be fakes. You also very well know that Retired Detective Superintendent Malcolm Thompson, a past president of the Institute of Incorporated Photographers in England, analyzed the pictures came to the same conclusion:
INTERROGATOR. Mr. Thompson would these photographs be acceptable as evidence in a British court of law?
Mr. THOMPSON. No. I have examined these photographs and have established without doubt that there is retouching on them and it is a basic principle with a forensic photographer that he would never, never retouch a photograph in any form of litigation.INTERROGATOR. What would happen in a British court of law if photographs like this were produced as evidence in a murder case?
Mr. THOMPSON. If they were produced in a murder case then the defending counsel without doubt would have an expert examine them and if retouching was found on them then they would not be included in the evidence.
INTERROGATOR. Are you saying that if photographs like this were produced in a British court of law in a case, they would be thrown out?
Mr. THOMPSON. I do. Yes. They would be thrown out.
INTERROGATOR. Is there any possibility in your mind that those two photographs are genuine?
Mr. THOMPSON. I don't think there is any possibility having examined them for a considerable time it is my considered opinion that
they are not genuine.
http://michaelgriffith1.tripod.com/faulty.htm
And then there is Brian Mee.
"Mr. Mee is a Depart of Defense (DOD) photographer and photo lab
technician. He has worked in photography for 18 years. He has
been a DOD photographer and technician for 10 years. Mr. Mee
has studied and had on-the-job training in negative retouching,
print development, shadows, and negative analysis. In addition,
he has had technical courses in color print development and
color negative development at the Winona School of Photography,
Winona, Wisconsin, which is affiliated with the Professional
Photographers of America School. He has also had courses in
automatic printing and in using computer video analyzers at the
KODAK School of Photography in Rochester, New York."
* On the issue of Jack White's work, Mr. Mee said that overall
it was pretty good. He stated that in his opinion White had made
some errors, but that White was correct on a number of important
points."
" Mr. Mee maintained that the panel's own photogrammetical
measurements indicated fakery in the backyard photos. He noted
that the panel admitted that it found only "very small"
variations in photogrammetical measurements of distances between
objects in the backyard. Mr. Mee said that given the manner
in which the photos were reportedly taken, by an amateur at that,
it was highly unlikely that the camera would have remained almost
in the exact same position for each picture. He observed that
there should have been much more variation in the measured
distances if the pictures were taken the way Marina Oswald
said they were. Mr. Mee had more to say on this point, and
for those additional comments I would refer the reader to
the transcript of our meeting."
http://the-puzzle-palace.com/files/MEE.001
Further evidence of fakery is the fact that the backyard photos were seen to be in the possession of the FBI at a photo processing plant, the day before they were "found."