I have a small 6.3mm lens camera module I would like to put inside a weather protected housing but I need a window for it to look through. These are a bit cheaper than germanium but will they work to pass IR in the proper range and in the proper amount for a camera to see through? These guys indicate they work well for that. https://www.edmundoptics.com/f/zinc-selenide-znse-windows/13195
Here is a link to one on ebay for description purposes.