18mm ZnSe F50.8mm focus lens right side installation confused

[tk107]

i read some threads on the internet with some saying the convex side is the final output of your focus while there are others saying it is the flatter side output of the focus, which is which???

so is it A OR B ??

[Tech_Marco]

To our lens, it is concave facing down or curve-up facing up ( where beam is coming from)


Marco

[tk107]

thanks marco!