As for the film resolution limit of 4mm....that applies to the Dahinden cibachromes.
If that's magnified 133 times...the image would be roughly 93 inches wide, by 46 inches high.
That's about 8' wide by 4' high.
Sweaty:
Looking online I don’t see any references to the size of the Cibachromes, however two sources one being Fahrenbach a skeptic and the other a proponent BFRO both refer to the Dahinden cibachromes as being enlarged 133x that being the case I am going to accept the number to be accurate.
http://www.bfro.net/REF/THEORIES/closure.asp
http://www.bigfootencounters.com/biology/fahrenbach.htm
I double checked your numbers 93 inches by 46 inches and came up with something different. Here is how I arrived at my numbers:
The gate of a 16mm camera is 9.35 mm x 7.0 mm, essentially the gate is the rectangular opening that is between the film and the lens. This gives the film its aspect ratio of 1:33/4:3, given that the gate restricts what can be exposed this is the number I used.
9.35 mm x 133= 1243.55 mm converted to inches is 4.0799 feet
7.0 mm x 133= 931 mm converted to inches is 3.054 ft
This is roughly what you would expect from film that has a 1:33 aspect ratio
The process of enlarging doesn’t include the enlargement of the entire frame, what some on does is isolate a section, crop it and then enlarge, so there probably never was a 4’x 3’ print made, however I would guess that if someone took the ratio of Patty in the frame to the frame size itself it probably would come to a standard photo paper size, my guess is the person making the prints was going by the largest paper available to them not the desire to enlarge 133X’s, anyone with photo experience might recognize the number as being a standard I don’t know.
That doesn't seem right. Do you know what the size of the cibachromes were?
So for clarity (1) it seems that you disagreed with the results based on the thought that the cibachrome might not be enlarged to 133X, citing opposing sources it appears to be an accepted fact. Also consider finding a digital version of frame 352 and superimpose your image onto it to determine if the size is the same.
(2)You also disagreed with the assessment because your calculations came up with 8ft by 4ft, check my numbers to make sure I have done it correctly coupled with the explanation on how enlargements are made (not the entire frame) let me know if you still stand by the belief that details from a cibachrome of a 16mm film enlarged 133x could show details under 4.2mm.
Rick