They had not been detected by any of the dozens of experts who have pored over the shroud because they were created by cryptic patterns of brushstrokes and are almost invisible to the naked eye, he said.
It was natural that Giotto was chosen for the task by the Church because he was "one of the best known and most able painters of the medieval age", said Mr Buso, an art restorer from Treviso near Venice.
His controversial theory will revive the centuries-old debate over the authenticity of the relic, which appears to show the imprint of a man with long hair and a beard whose body bears wounds consistent with crucifixion.

as I worked in Germany. This Giottos only weights 3 lb (1.36 kg), yet extends to 62.6" (159cm). And when it's time to fold it up to pack in the suitcase, it only takes up 15.6" of space thanks to its ingenious "reverse technology" legs, that when collapsed, fold 180 degrees and surround the tripod center column and head. This also means that you have great flexibility in positioning the legs at any angle you may need while shooting.