Here an interesting scientific analysis. It works.
https://research.lpubatangas.edu.ph/wp-content/uploads/2020/01/APJAHS-2018-001.pdf
mostly – but not only – about film photography
Here an interesting scientific analysis. It works.
https://research.lpubatangas.edu.ph/wp-content/uploads/2020/01/APJAHS-2018-001.pdf