I looked up filters commonly used for night vision and it seems the astro long pass filters are quite expensive: https://www.bhphotov...5nm_filter.html for 685nm.
For general photography, there are options for IR filters such as this one: https://www.amazon.c...ctronics&sr=1-4
It's cheaper and larger in diameter! It's adjustable from 530 to 720nm! That seems pretty useful to dial in depending on the amount of light pollution in your environment. Is this better than the astro filter?
Lastly, how would one want to mount it on a PVS-14?