A Deeper Technical Investigation into K-r's Front Focusing Issue under Tungsten (Part 2)

This Post is Continued from the Last Part.After all those tests and measurements and with much hope in resolving the problem, I quickly acquired an IR block/stop/cut filter to see IF the problem could be eliminated:-The filter is essential a glass filter with heat reflective coating on it. As such, it is also known as hot mirror, besides calling it a IR blocking filter. (More product brochures