[mlmr]

Interesting. I didn't realize that medieval people had windowpane style glass available.

[BushCountry]

The images produced by the Beauchamp painting did not match the finesse of the original, but aptly demonstrated the viability of the technique.

I really get sick and tired of sites like these. There have been hundreds of explanations of how the shroud was created, yet no one, I repeat, no one can duplicate the Shroud exactly. With thousands of years of technological advancements in science, I will not be happy until someone can precisely duplicate the Shroud exactly, using technology from the correct time period. I do not want to hear that it is possible until it can be proved.

[Salamander]

Window panes were made by spinning a blob of molten glass on a rod.
I watched a Williamsburg reenacter do it on a TV show once and he said up until very recent times, it was not possible to get more than about a 2 foot circle of "window pane".
Out of that circular more-or-less flat piece of glass, small square or rectangular panes were cut.
That why medieval and ancient windows had so many panes of glass of in them.
It wasn't for "looks"; it was simply because bigger panes of glass weren't possible yet.
My house is almost 300 years old and there are still original panes left in most of the windows.
You can see pontil marks and "bull's eyes" where the glassblower cut it off of the rod.
The glass in the old windows is all "wavy" to some extent and the thickness of each pane varies wildly, even within itself.

I can't imagine where they found a man-sized sheet of glass back then.
[let alone knew how to make photo-negative images]