NOT KNOWN FACTUAL STATEMENTS ABOUT UNCOOLED LWIR LENSES

I applied a Sony FE twelve-24mm file/4 on an a7 II entire body converted to 665nm infrared. This is one of my most loved lenses for broad angle with infrared for the reason that if performs so very well and covers an ultra big selection. You can obtain very hot places with apertures smaller sized than f/8 but with ultra wide lenses similar to this