NOT KNOWN FACTS ABOUT UNCOOLED LONG-WAVE INFRARED LENSES

I utilised a Sony FE 12-24mm file/four on an a7 II human body converted to 665nm infrared. This is one of my most loved lenses for large angle with infrared due to the fact if performs so effectively and covers an ultra wide selection. You can obtain very hot spots with apertures smaller than file/8 but with ultra large lenses similar to this you w