I haven't watched the whole video yet, but I own a very high-quality PVS-14. I've mostly solved the depth of field issue for myself with an iris in front of the

I haven't watched the whole video yet, but I own a very high-quality PVS-14. I've mostly solved the depth of field issue for myself with an iris in front of the objective lens. There is a tradeoff to make between available light and DoF, but outdoors I can turn it to about 1/3 open and see clearly from ~2' to infinity. I found a well-made iris mechanism on eBay, designed for microscopes. It fits the threads on the objective lens exactly, and has another set of threads on the outside to which a sacrificial lens can be added for protection if desired. I'm really happy with it.