3 ms·
These were all known since 1920s-1960s and very little progress has been made since. Everything you named is bog standard film photography practices.
by varjag 8y ago
These were all known since 1920s-1960s and very little progress has been made since. Everything you named is bog standard film photography practices.
- sandworm101 8y agoYes but the use of a particular technique in a particular location/time would divulge the specific collection goals of an operation, something that often remains classified long after the operation itself has been acknowledged. So while the existence of UV film is no secret, knowledge that it was being employed over a specific site at a specific time can be.