Some good points by Roger Knights:
The basic point made by inmylight & soarwing above is that if Patterson had wanted to make a film that would have had more commercial appeal, and/or more scientific acceptance, he could easily have done so with no loss of credibility. He could have shot a stabilized film--in the days before stabilization, jerkiness made it hard for audiences to get a good focus on the creature, and made the viewing experience unsatisfying and unconvincing. The jerkiness wasn't useful in concealing flaws of the costume from examination, since he immediately made copies of the film available to scientists for detailed examination at their leisure. That would have enabled skeptics to examine the still frames, which is where flaws would have shown up, if he was worried about such things.
But, as can be seen, subsequent examination of the still frames, or blink-animations of very short segments, have tended on the whole to reveal authenticating details, like the calf bulge and toe-splay on touchdown, the foot bending at the mid-tarsal joint (in 3 sequences), the foot embedded an inch in the sand, tendons appearing at the proper points in the stride, level lower leg lift (which is not apparent when viewed in motion), vertical sole prior to toe-off, mobile kneecap, flexing hand, opening and closing mouth (per Owen Caddy, working with DDA's clarified B&W frames), etc. None of these details BTW would have been easy for a hoaxer to add, and none were noticed in the early days or pointed out by RP as evidence of authenticity, so they gained him nothing. These are more things a commercial hoaxer would have done differently (omitted in this case).
Because he used a good camera (Kodak--though there were cheaper models around), and good film (Kodachrome II had the finest grain, and was very costly: $30-$40 per roll), and good film size (16mm--when 8mm would have hidden details far better), and had the focus set properly, and had the exposure only slightly off, and because he filmed the creature in the open in good sunlight on a level surface (making analysis of its stride and body proportions easier), he was risking a lot if there had been a costume involved, and making fraud detection by analysis of the still frames easier.
If he'd been hoaxing he would have grabbed an 8mm camera and filmed from a stable platform (standing or on his horse), not attempting to close the distance, which caused him to tremble from exhaustion & fear when he got close--and closeness risked revealing more details. He'd have claimed the initial encounter occurred at a much greater distance than 30 feet, saying Queen Kong heard their approach, which would have seemed reasonable. (Indeed, all Patterson gained from his courageous close approach was more sneers that Patty should have heard his approach (hoofsteps muffled by sand and a noisy stream!) and been more alarmed about it.) He would have slowed down the film speed (to speed up Patty's walk beyond the human range) without telling anyone that he was unsure of his speed setting--no one would have been able to prove he'd sped it up (or even thought of the possibility), and he wouldn't have lost credibility by casting doubt on his own film. He'd have claimed if hoaxing that he couldn't get the film started when the creature was closest because he had to get the lens cap off and the controls set--and would have said that if he'd the cap off and controls set right to begin with (as RP did) that that would have been fishy. He would have said the didn't get the settings right because he was in a hurry, so the film is fuzzy. (The original PGF, and extractions made from the in-focus color emulsion layer of the first-generation copies, are not fuzzy, which a hoaxer would have been sure to have done.)
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