[Nikas777]

The question is not whether modern investigators can figure out some way to produce a reasonable copy of the Shroud but, given the quality of forged Medieval artifacts in general, why they would have produced a forgery so good that modern researchers still puzzle over it and that’s so difficult to see without modern photographic equipment.

My opinion it is if this Shroud is not the Holy Mandylion looted by the Crusaders from Constantinople then it is a copy of the Greek church's Holy Mandylion from Constantinople. The making of high quality reproductions of relics was not seen as a forgery and copy of a relic was seen as worthy of veneration and highly sought after in the west.The west may have had primitive technology but Constantinople was far from primitive in artistic skills and technology.

[Question_Assumptions]

My opinion it is if this Shroud is not the Holy Mandylion looted by the Crusaders from Constantinople then it is a copy of the Greek church's Holy Mandylion from Constantinople.

I consider those two options quite plausible, the first more plausible than the second. Like I said, my opinion is that it's either authentic or a copy of something that was authentic, leaning heavily toward authentic.